Where can I buy just enough perspex to cover the side of a case? i.e. about 50x50cm. I've been to Focus and Homebase but the cheapest they have is £14 for a huge sheet. When I asked if I could buy just half a sheet I was told "Yes but I would have to charge full price". I went to Hobbystores but they only go up to A4 size. Checked ebay and the prices they're selling it for are silly.
Also, are people just using rotary tools to cut the case? I have a cheap one with what is supposed to be a cutting tool but pretty much all it does is strip the paint.