Jerry,

Sheet PVC is offered by most sign supply and plastics wholesalers.
It's important to get .75 and 1" white materials. The colored versions are not exterior rated. Black will warp like crazy.

The best adhesive is made by Gorilla Glue. It's called out as PVC glue. You want the clear version. I buy mine from Amazon i quarts. Don't use the stinky, fast drying, plumbers glue. It won't hold on large panels.

I pay about $119. for .75" and $145 1". from Allied Plastics. Any brand will work.

I have no idea where you live so can't suggest a vendor.

Best Wishes,

Joe