MushroomPriceIndex

King Oyster (King Trumpet): what do the growing supplies cost?

King Oyster (King Trumpet) supplies are sold in 5 product categories (grow kits & fruiting blocks, grain spawn, spawn (medium not stated), liquid culture, agar & lab) across 2 US vendors — 18 listings tracked, 17 in stock, updated September 4, 2026. Prices below are grouped by category because a grow kit, a bag of spawn and a culture syringe are different products; comparing them against each other would be misleading.

Grow kits & fruiting blocks

Cheapest today
$18.00/kit
Median
$24.00/kit
Highest today
$29.99/kit
In stock now
7
VendorListing Per kitListing price Stock
North Spore Black King Oyster 'Plant & Grow' Mushroom Starter Block — 8-Pack (8 kits) $18.00 $144.00 in stock view →

Price history — grow kits & fruiting blocks (daily median)

$22.80$24.00$25.20Jul 20: $24.00Jul 21: $24.00Jul 22: $24.00Jul 23: $24.00Jul 24: $24.00Jul 25: $24.00Jul 26: $24.00Jul 27: $24.00Jul 28: $24.00Jul 29: $24.00Jul 30: $24.00Jul 31: $24.00Aug 1: $24.00Aug 2: $24.00Aug 3: $24.00Aug 4: $24.00Aug 5: $24.00Aug 7: $24.00Aug 8: $24.00Aug 9: $24.00Aug 10: $24.00Aug 11: $24.00Aug 12: $24.00Aug 13: $24.00Aug 14: $24.00Aug 15: $24.00Aug 16: $24.00Aug 17: $24.00Aug 18: $24.00Aug 19: $24.00Aug 20: $24.00Aug 21: $24.00Aug 22: $24.00Aug 23: $24.00Aug 24: $24.00Aug 25: $24.00Aug 26: $24.00Aug 27: $24.00Aug 28: $24.00Aug 29: $24.00Aug 30: $24.00Aug 31: $24.00Sep 1: $24.00Sep 2: $24.00Sep 3: $24.00Sep 4: $24.00Jul 20Sep 4

Grain spawn

Cheapest today
$29.99/bag
Median
$29.99/bag
Highest today
$29.99/bag
In stock now
1
VendorListing Per bagListing price Stock
North Spore Organic King Trumpet Mushroom Grain Spawn $29.99 $29.99 in stock view →

Price history — grain spawn (daily median)

$28.49$29.99$31.49Jul 20: $29.99Jul 21: $29.99Jul 22: $29.99Jul 23: $29.99Jul 24: $29.99Jul 25: $29.99Jul 26: $29.99Jul 27: $29.99Jul 28: $29.99Jul 29: $29.99Jul 30: $29.99Jul 31: $29.99Aug 1: $29.99Aug 2: $29.99Aug 3: $29.99Aug 4: $29.99Aug 5: $29.99Aug 7: $29.99Aug 8: $29.99Aug 9: $29.99Aug 10: $29.99Aug 11: $29.99Aug 12: $29.99Aug 13: $29.99Aug 14: $29.99Aug 15: $29.99Aug 16: $29.99Aug 17: $29.99Aug 18: $29.99Aug 19: $29.99Aug 20: $29.99Aug 21: $29.99Aug 22: $29.99Aug 23: $29.99Aug 24: $29.99Aug 25: $29.99Aug 26: $29.99Aug 27: $29.99Aug 28: $29.99Aug 29: $29.99Aug 30: $29.99Aug 31: $29.99Sep 1: $29.99Sep 2: $29.99Sep 3: $29.99Sep 4: $29.99Jul 20Sep 4

Spawn (medium not stated)

Cheapest today
$25.70/unit
Median
$25.70/unit
Highest today
$25.70/unit
In stock now
1
VendorListing Per unitListing price Stock
Out-Grow King Oyster Mushroom Spawn, 1 Quart Jar $25.70 $25.70 in stock view →

Price history — spawn (medium not stated) (daily median)

$16.80$21.58$26.36Jul 20: $17.46Jul 21: $17.46Jul 22: $17.46Jul 23: $17.46Jul 24: $17.46Jul 25: $17.46Jul 26: $17.46Jul 27: $17.46Jul 28: $24.95Jul 29: $24.95Jul 30: $24.95Jul 31: $24.95Aug 1: $24.95Aug 2: $24.95Aug 3: $24.95Aug 4: $24.95Aug 5: $24.95Aug 7: $24.95Aug 8: $24.95Aug 9: $24.95Aug 10: $24.95Aug 11: $24.95Aug 12: $24.95Aug 13: $24.95Aug 14: $24.95Aug 15: $24.95Aug 16: $24.95Aug 17: $25.70Aug 18: $25.70Aug 19: $25.70Aug 20: $25.70Aug 21: $25.70Aug 22: $25.70Aug 23: $25.70Aug 24: $25.70Aug 25: $25.70Aug 26: $25.70Aug 27: $25.70Aug 28: $25.70Aug 29: $25.70Aug 30: $25.70Aug 31: $25.70Sep 1: $25.70Sep 2: $25.70Sep 3: $25.70Sep 4: $25.70Jul 20Sep 4

Liquid culture

Cheapest today
$12.73/syringe
Median
$16.36/syringe
Highest today
$19.99/syringe
In stock now
2
VendorListing Per syringeListing price Stock
Out-Grow King Oyster Mushroom (Pleurotus eryngii) Liquid Culture Syringe $12.73 $12.73 in stock view →
North Spore Organic King Trumpet Mushroom Liquid Culture Syringe $19.99 $19.99 in stock view →

Price history — liquid culture (daily median)

$16.16$16.27$16.37Jul 20: $16.17Jul 21: $16.17Jul 22: $16.17Jul 23: $16.17Jul 24: $16.17Jul 25: $16.17Jul 26: $16.17Jul 27: $16.17Jul 28: $16.17Jul 29: $16.17Jul 30: $16.17Jul 31: $16.17Aug 1: $16.17Aug 2: $16.17Aug 3: $16.17Aug 4: $16.17Aug 5: $16.17Aug 7: $16.17Aug 8: $16.17Aug 9: $16.17Aug 10: $16.17Aug 11: $16.17Aug 12: $16.17Aug 13: $16.17Aug 14: $16.17Aug 15: $16.17Aug 16: $16.17Aug 17: $16.36Aug 18: $16.36Aug 19: $16.36Aug 20: $16.36Aug 21: $16.36Aug 22: $16.36Aug 23: $16.36Aug 24: $16.36Aug 25: $16.36Aug 26: $16.36Aug 27: $16.36Aug 28: $16.36Aug 29: $16.36Aug 30: $16.36Aug 31: $16.36Sep 1: $16.36Sep 2: $16.36Sep 3: $16.36Sep 4: $16.36Jul 20Sep 4

Agar & lab

Cheapest today
$26.47/plate
Median
$74.99/plate
Highest today
$74.99/plate
In stock now
6
VendorListing Per plateListing price Stock
Out-Grow King Oyster Mushroom (Pleurotus eryngii) Mushroom Plate Culture $26.47 $26.47 in stock view →
North Spore King Trumpet Mushroom Plate Culture — NSPE1 - Stephen King Trumpet (Pleurotus eryngii) $74.99 $74.99 in stock view →

Price history — agar & lab (daily median)

$71.24$74.99$78.74Jul 20: $74.99Jul 21: $74.99Jul 22: $74.99Jul 23: $74.99Jul 24: $74.99Jul 25: $74.99Jul 26: $74.99Jul 27: $74.99Jul 28: $74.99Jul 29: $74.99Jul 30: $74.99Jul 31: $74.99Aug 1: $74.99Aug 2: $74.99Aug 3: $74.99Aug 4: $74.99Aug 5: $74.99Aug 7: $74.99Aug 8: $74.99Aug 9: $74.99Aug 10: $74.99Aug 11: $74.99Aug 12: $74.99Aug 13: $74.99Aug 14: $74.99Aug 15: $74.99Aug 16: $74.99Aug 17: $74.99Aug 18: $74.99Aug 19: $74.99Aug 20: $74.99Aug 21: $74.99Aug 22: $74.99Aug 23: $74.99Aug 24: $74.99Aug 25: $74.99Aug 26: $74.99Aug 27: $74.99Aug 28: $74.99Aug 29: $74.99Aug 30: $74.99Aug 31: $74.99Sep 1: $74.99Sep 2: $74.99Sep 3: $74.99Sep 4: $74.99Jul 20Sep 4

We check King Oyster (King Trumpet) supply prices at every vendor we track, every day. How the index works · All categories · All tracked species