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Cheaper? Check US Plastics...they are were I get my flat stock from and are about the cheapest I have found. I didnt check the prices to compare though, but take a look at them.
Thickness? Depends. Once you get over 1 mm thick or so, it becomes more work to score and snap...so if I need thicker than that, I wilk normally laminate up two or more layers. I have some really thick stuff as well (up to about 1/8 inch thick) but I cut that differently and it is mainly just used for squares and rectangles of one form or another. 0.5 mm sheet is probably what I use the most of though. Brain is probably off on this, but that should be something like 0.04 inches or so...give or take whatever it needs to be correct.
If I need thicker than that I will use a cellular core PVC panel or plexiglass as I can cut those more easily using my table saw and other wood working tools.
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