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I've only bought acrylic once and it was recent. I found pretty reasonable prices and shipping at Delvie's Plastics: LINK
It's about $6 per square foot for 1/8 thick. I bought 5 sheets to make...

Don't put too much weight on my advice, because I'm pretty new at this. But, here's a couple of thoughts:

-- The range you quoted of up to 0.12" is just about 1/8 (0.125"). So you don't have to...