FREE: Looking for Foam Pads/Mats

Hello everyone, I’ve been trying to collect these for my girlfriend who is in the early childhood education program. Anytime I try to grab them on here they seem to be gone within 10 minutes of the post. Really looking for any sizes, shapes, basically anything interlock-able. Numbers, letters any type of design. Not looking for great condition because I don’t mind a little clean up but unfortunately for two college students these things are a little pricey. Thank you for taking your time to read this and hopefully hear from you soon.