nostr:npub14w37fjdpkezfacsz3q8r97yqs9e0cquntlfkamgdhewnpaud4x9qtu9vjx if you're looking for teaching aids, as in semi-disposable boards, this things might be better.

https://a.aliexpress.com/_EQZ462F

You know, they're cheaper, they have regular pins you can use with breadboards and the chip is pretty much te same too.