Cumberland turtle?

I have recently bought 2 cumbrian semi aquatic turtles. I'm aware that in time they will need a lot bigger tank. I was wondering if anyone knows of a good website that sells larger turtle tanks?
Answers:
i have 3 cumberland sliders and 1 yellow bellied terrapin at the moment, if females your sliders will get to approx 14 inches across the shell. males only stay smaller around 8 inches.
as well as the tank size, please make sure you have adequate UV lighting for them, and more than adequate filtration, for terrapins / sliders, the best way to do it is filter for double your tank. if you have a 4 foot tank, put enough filtrarion in for a 8 foot. terrapins / sliers are dirty eaters and you will need plenty of filtration to keep up with them.

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I bought my tank from Seapets, not only were they cheaper there, they deliver free of charge. By the way, what are Cumbrian turtles? I live in Cumbria and have never heard of them. I think this is a leg pull.

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http://www.turtlesale.com/home/index.php...