I am looking to buy some 3m vinyl pieces. Like the stuff they use for stripes except in just a square sheet. I dont need a lot just like a 3x3' piece. Anyone know where to get some?

 

Try ebay. They sell it in small rolls for pretty cheap in all colors.

 

I was looking on ebay but I couldnt find any... what do I search for on there? I found 3m vinyl tape but thats about it...

 

i know this isnt exactly what you are looking for, but its 24" wide and that is as wide as i found it. or you could prob go to a graphics shop in your area and im sure they would either give you a section of it or sell it to you.
vinyl

 

Try Fellers.com They sell to sign companys. They will sell you however many yards you need.