Not available in the UK though; the only way I know of is to either make one yourself (there's instuctions on how to do it in the DIY section) or import one.
I just use a hose out the window for emptying and a hose from the tap to refill; the only buckets I use are what I've needed to clean the gravel (two or three per tank).
Anyway, marie's tank is only 60l, a python might be a bit over overkill there tbh!