+1 there's absolutely no way to say an enclosure will cost this many $$$ (sorry, don't know how to get the pound symbol on my keyboard..lol) it is all about how much you want to spend. my suggestion is to spend the most amount of your budget on life support (filter, heating,and a very secure lid). and any extra cash to buy healthy animals. yes, the chain store down the street may be a few pence cheaper, but are they more healthy? most importantly, read the care sheet, then read it again. remember, just because you start them in one tank, doesn't mean they have to spend their entire lives in it. your enclosure can always grow as your skills and knowledge grows