Activity for Genny

I purchased signage on Etsy. I would like to make one sign 16x20 with no frame. I assume a poster is too thin to stand alone on an easel. What do I need to purchase instead of poster? Thanks!

I have purchased signage from Etsy. I am wondering if anyone has suggestions on where to go for very affordable printing on large prints (like 16x20)? I am also wondering what is best to purchase so the signs are thick enough to not need frames?...