Local sources for acrylic or glass (cheap) for sump baffles?

In the IC/CR area?
Looking for 1/4" glass/acrylic/ABS for baffles in my sump.  Black ABS would be ideal if cheap enough as it would prevent light transfer/algae growth outside the fuge into the rest of the sump.
Have a 20g long (thanks AJ) and will be putting the skimmer outside so it'll be drilled.
Looking to install 6 baffles, all 8"x11 3/4" for an 8" internal level, standard sump/fuge design.
Called Marv's in Iowa City, they want $38.10 plus tax or $6.35/panel for 1/4" glass - sounds pricey!
Thinking it might just be cheaper to find a sheet of acrylic and cut it myself.  I can cut glass myself, but would then need to worry about the edges and the shops usually give the edges a quick buff.
While I'm at it - I used 1/4 glass before that was left over from an Oceanic glass top, had Hung do a sump and he used acrylic, can't remember if it was 1/8" or 1/4".
This will be a simple sump/fuge with +/- 400gph and a maximum level of 8" so nothing special - suggestions?
Thanks!

 

Based on the size that I need, i.e. 8"x11 3/4", would 1/8" acrylic work? Smaller? do I need 1/4"?

Thanks for the responses so far!