Cant help you but can only wish you luck in your search!!
My ex and I managed to find an aquatic shop closing down but even still in poor conditions, you are looking at £600 - £700 for one unit!
Even more gutting when we bought 4 and one then got stolen!!!
They are hard to keep clean and maintain, tbh we found it easier to buy clearseal tanks, drill the back with two holes, line all the tanks up on concrete blocks (then boarded in to look good) and used joins and pond hose to link all the tanks and ran them on banks off a pond filter with UV. Even the 'bodge job' tanks were made to look good but couldnt do much with the JA ones.
But as i said... good luck!