You'll have to let us know when they arrive. One pharmacy/ hardware store here used to have sales on nice glads that were almost that cheap, before they closed most of their stores. Sigh.

Yes, probably quite small & if you get flowers this year, they'll probably be less than impressive. But perhaps if you give them good soil & a bit of fertilizer, the corms will grow bigger and perform better next year.

I would also guess these won't be named cultivars, but more of a common, run-of-the-garden mixture. Sometimes it's fun to see what develops from a grab bag collection. Let us know how it goes.