What would be the cost for 2pcs -3’x3′ signs that say “$100 gas or gift card” in red letters that I can attach to my sign? It can be the thin coroplast.

3’x3′ is not a convenient size; we have to use the whole 4’x8′ coroplast sheet for 2 signs. So (2) 36″x36″x4mm white coroplast signs with cut out vinyl images on 1 side are $50/sign.