OK, How about Dry Suits?

[Swimjim]

Theres alot of things you can get a deal on online, you could do this with a drysuit but I wouldn't recommend it.  This is an item that needs to fit properly to work well.  Some shops will even throw in a few charters and instruction on how to use the thing.  I would recommend you visit three or four dive shops and see what they have to offer.  You may pick up a good used suit this way.  
    You most bang for the begining buck is probably going to be neoprene.  These suits are generally less expensive(not crushed neo though) and hold up well enough for the average bloke.  A friend of mine dives dive an O'Neill he picked up for $600.00 brand new.  Another dives BARE and those run around $900.00, I think.  Don't quote me.  One big advantage to Neoprene is you done need to have ultra expensive under garments.  Polypro under garments found at Sherpa's down in Milwaukee and a jogging suit will take you a long way.  
      I dive a dive concepts Z-Flex.  This is a trilamenate suit that features a zipper across the chest for self donning.  Alot of suits are shoulder zip and you have to rely on a dive buddy to zip them for you.  The trilams are great suits, but they require a complement of undergarments for insulation and these can get pricey.  
     I think the least expensive DUI suit is there TLS 350 and that weighs in at a hefty $1400.00.  They are good suits, but its like buying a Nikon camera compared to a Minolta.  Both work very well, but you pay extra for the Nikon sticker.

Jim