making my first C&C cage for my first guinea pig (need help, advice)

scroll down on this link and it will tell you the dimensions you need as well as supplies
https://www.guineapigcages.com/howto.htm
You probably need to find out how big a full sheet is, so give sign-a-rama a call.
My coroplast only covers half a cage so I end up taping two together and then making the cuts.
With some grids I end up using zip ties in addition to the not so snug connector. So I also have a wire cutter for easy removal of zip ties.

I don't know about in Florida, but the Sign-a-rama in CT tried charging me price of a full sheet for only a part of it.

I would say your best bet is to thumb through the phonebook and look for independently owned stores and call them up, give them the dimensions you need and get a price estimate before you go get it.

When I was looking for it one sign-a-rama wanted $36 for a part of the sheet (price of whole sheet) and another in a different town wanted almost $90!!!!!
I aslo called Kinko's and they wanted $130 for a 28inx42in piece!

As for the grids, just make sure they are NOT from Target, the holes are too big and can kill a piggie. I got mine from Bed, Bath and Beyond for $15 to make a 2x3 cage with a bottom (since her table is about 2 inches too small I need to have a bottom so the grids stay around the coro.

Good luck on your search!

A full sheet is 4ftx8ft. A place by me charged me around 13 for it. I have a 3gridx3grid with a 1gridx2grid loft and I only needed one full sheet for it.