Well I found three local places (Toledo, Ohio USA) that cary it in 3mm for between 35 and 50 USD ea. Only one of these had it in 2mm and none had 1mm. In a stroke of luck when I visited one of these vendors after work I scored a free 4' x 4' "scrap" sheet of 3mm white free of charge, woot! Looks like my girls will be getting their armor sooner than expected. Thanks to all for the responses. I still need to find some thinner material for the fine details. The only sintra signs I could fins at Lowes and Home Depot were about 2' x 1' maybe .5mm and cost 8.96 USD each. Seems a bit of a rip off to me. Where is everyone finding these thicker signs they are using?