Where abouts are you? There is a place in Pinellas Park called American plastics, great little family owned place. They always beat the prices at Farco by quite a bit. Are you using this for a bare bottom tank? If so I'd really suggest going as thick as you can afford, well to a point, thickest I'd say would be 1". I only say this because I know you'll be putting rocks on it but even the thick stuff floats, I have 3/4" in my tank and without the rock it still floats, not as much as the 1/4" previously did.