If you haven't ever taken time to check out your local branch, you have no idea what you are missing out on. There are lots of "surfaces" to find for projects for a fraction of what you might pay at the hardware store.
Some of my favorite things that they always have on hand are their window sashes, cupboard doors, tiles. I have never been disappointed by what I have come away with.
It is salvaged product or excess product from projects others have done, and all donated. Kind of like you thrift store for construction junk. It is well organized and easy to locate what you want to find.
You can also find paint, and knobs which I have used on projects.
This is a super thrifty idea to find a surface to place any vinyl graphic or saying...now I have told you all about my secret! So good luck finding a fun surface and let's design something together!