when in doubt about an retailer/e-tailer...I always suggest looking for them at:
http://www.ResellerRatings.com
If they either have a bad rating OR do not exist on the site and you have never done business with them before...keep walking out the door.
Granted some new smaller sellers are not, or maybe even ever, going to show up on that site, but still for these sort of items, the old adage of "...if it is too good to be true...it is..." really applies.