I've never experienced this myself, but hears of it happening during the original Storm and Droid launches.
My guess would be that the OP was in a store with low stock on this phone. I've heard of this happening before because they have quotas as far as how many new or extended contracts they have to get. They actually don't make any real money on the phone (even at full retail they basically make about a hundred to a hundred fifty bucks but make about $700 over two years (on the data plan alone), plus calling plan and features and loose about $200 on the sale itself.
They point is, selling the phone to you they basically make $150 or so on the deal. A new contract or upgrade is gonna get them hundreds (thousands, if the calling plan is right) over the next two years.
Sucks I know, but that's how they look at it.....
EDIT: For what it's worthy I got mine full retail but I pre ordered mine and had it they day before release.