You can\'t beat hiring one from TriUK. £25 plus postage (£10 each way) for the full season. They\'re reasonable suits, I used one last season, perfect for getting started, and you won\'t have to shell out a wasted fortune if your fear of crocs, pike and sharks gets the better of you!!! (it won\'t, just don\'t swim alone).
I now own one of their slightly better model suits, which they flog 2nd hand for around £100.
Many triathletes are obsessed with fancy kit, and tend to be moderately well off. However, you can do it on a budget. Its the body that counts more than the kit. Good luck