Best price listed is not always the best price...many shops may list a cheap price, but then try to sell you options that should be included in the kit, like a battery charger and battery, at inflated prices. Take a look at this article:
http://www.pcworld.com/howto/article/0,aid,107855,00.asp
Also, when dealing with a retailer you never dealt with before, always check
http://resellerratings.com
Personally I choose store service and reliability over cheap price any day.