>140 gallon sump or beat up acrylic tank San Diego or South OC

I'm replacing all the sumps and canister filters in my fish room and placing all the tanks (>2000G) on a central sump. I'll need about 300 G more (I have a 200 G sump) to get to about 500 G for backwashing and water changes. I will chain them together with 3" bulkheads. Old beat up acrylic 150 or 180 G would be perfect. Must be under 30" high. I don't want glass (too heavy and a pain to drill). I would consider a 240 or 300 G but don't expect to find even a scratched one for about $2/G. Let me know what you have, how much and where.