Grain spawn: prices across US vendors
16 species and 113 current listings at 2 vendors, updated October 20, 2026. Every price on this page is per bag, and all of it is one product category — so these numbers are directly comparable. A bag here is never compared to a product in another category.
Sterilized grain (rye, millet, sorghum) colonized with mycelium, for expanding into bulk substrate. Priced per bag; weight varies, so read the listing.
By species
| Species | Low | Median | High | Listings | Vendors |
|---|---|---|---|---|---|
| Blue Oyster | $34.99 | $34.99 | $34.99 | 2 | 1 |
| Shiitake | $34.99 | $34.99 | $34.99 | 1 | 1 |
| Reishi | $34.99 | $34.99 | $34.99 | 1 | 1 |
| Lion's Mane | $34.99 | $34.99 | $34.99 | 1 | 1 |
| Pink Oyster | $34.99 | $34.99 | $34.99 | 1 | 1 |
| Nameko | $34.99 | $34.99 | $34.99 | 1 | 1 |
| King Oyster (King Trumpet) | $34.99 | $34.99 | $34.99 | 1 | 1 |
| Italian Oyster | $34.99 | $34.99 | $34.99 | 1 | 1 |
| Snow Oyster | $34.99 | $34.99 | $34.99 | 1 | 1 |
| Chestnut Mushroom | $34.99 | $34.99 | $34.99 | 1 | 1 |
| Enoki | $34.99 | $34.99 | $34.99 | 1 | 1 |
| Pioppino (Black Poplar) | $34.99 | $34.99 | $34.99 | 1 | 1 |
| Maitake (Hen of the Woods) | $34.99 | $34.99 | $34.99 | 2 | 1 |
| Beech (Shimeji) | $34.99 | $34.99 | $34.99 | 1 | 1 |
| Black King Oyster | $34.99 | $34.99 | $34.99 | 1 | 1 |
| Elm Oyster | $34.99 | $34.99 | $34.99 | 1 | 1 |
Prices are per bag. Each species links to its own page, where this and every other category it sells in is broken out separately.
Not mapped to a tracked species
95 listings in this category aren't matched to a species this index tracks — either generic grain spawn that names no species at all, or a species outside our current coverage. They're compared here among themselves, per bag.
| Vendor | Listing | Per bag | Listing price | Stock | |
|---|---|---|---|---|---|
| Out-Grow | Grain Spawn Jar Lids and Rings - 12 pack : Regular Mouth (70mm) (12 bags) | $1.41 | $16.97 | in stock | view → |
| North Spore | 8-Pack Organic Sterilized Grain Spawn Bags (8 bags) | $17.50 | $139.99 | in stock | view → |