I'm looking to get a 550D at the moment, possibly tomorrow, and like yourself want a cheap price, obviously coupled with great customer service, and prompt delivery, etc. etc.
You have two choices really, shop around for the best deal from the respected suppliers, ie, Jessops, John Lewis, Park Cameras, etc. or try your luck for a cheap deal on ebay!!!!
Like in my business, I produce postcards and business cards for photographers, you either get, superb quality and great customer service, or you get cheap crap!!!
I don't provide cheap crap to my customers so I am not going to buy cheap crap then complain when the service is crap, etc.
Quite possibly due to the problems in Japan prices are fluctuating wildly, the 500D at Jessops has ranged from £579.00 up to £639.00 in the past few weeks. I was speaking to a member of staff in Jessops yesterday and he told me that stock seems to getting back to normal so perhaps prices will soon settle down. Right now the best price, outside of ebay and Kiss imports I can find for the 550D is £585.00 from Park Cameras.