I read a lot of complaints about other e-tailers that do that.
A lot of the NY-based camera dealers are like this. However, B&H is a standup company with absolutely no hassles involved. They've even fixed my own screwups on ordering without complaint or attitude. I highly recommend them. I also recommend Beach Camera and Buydig (the same company). Most of the other NY-based shops I'd be wary of.
Outside of NY camera shops, most of the big names are fine. Newegg is great, especially for memory.
check resellerratings.com before shopping with someone new online.