When I worked in photo retail cameras were frequently sold with no mark up. The prices were fixed by the supplier who owned the stock until it was rung through the till. Our money was made in D&P, filters, batteries, memory and warranties. The staff price on our own brand stuff was typically 70% less, film D&P was like 80% less, in comparison the staff price on big brand camera gear was usually higher than the retail price.
If you wonder why there seems to be consistent pricing between retailers this is why.
If you wonder why all the small retailers are going broke (no own brand accessories, less film D&P) this is also why.
This is also why you get so many 'extra value' packages that include rucksacks or a tripod and a memory card and cleaning kit... it's the only way the shops can make money.
Your best bet of a saving, and I don't necessarily condone this, is to get grey imports, but do bear in mind there are frequently hidden taxes and handling charges and warranty issues.