Walmart has them 2 for $17.97 you can even order them online, If you buy 5 packs like you want your shipping is free!
http://www.walmart.com/ip/2pk-24x36-Basi...
Hobby lobby
Where can I find 24 by 36 poster frames for under $10? I would like to buy at least 10 of them. And they don't have to be fancy, just a black border with plastic covering will do.
