I'm an indie researcher developing a diy-friendly approach to genetic engineering of mushrooms [1][2][3]. If anyone is interested, I'd be happy to provide a piece of the same slime mold species (Physarum polycephalum[4]) referenced in the article and used to study fungi memory and intelligence. It's pretty easy to grow and the only food it needs is oats.
The best way to send me your request is probably to send me a DM on Instagram or to email me (josh@everymanbio.com). Depending on how many requests there are, it may take me some time to get it to you - but I will.
A few $ donation for shipping would be helpful, but not required.
[2] https://www.instagram.com/everymanbio/