My recommendation is to see if the page that shows the camera, etc. you want to buy also shows a lot of "kits" and accessories. Then see what the market price is for some of the accessories by doing a search. If the site's prices are way above market, you really know what you are in for. Probably a hard sell, a call back 2 days later, an "in stock" item that is suddenly on backorder, etc.
You can also keep an eye on some of the "deal" sites like fatwallet or slickdeals for legitimate stores that may be having sales, discounts or coupons. That is how I got my HV20 at a bricks and mortar store for $150 off.