samsung blackjack sale

Can I be refunded my money after AT & T Wireless falling prices?
I really hope to get the Samsung Blackjack from AT & T Wireless, and when I browse in my local store representative said there could be a possible decrease in prices in certain their mobile phones popular in the coming weeks. My question is, should I buy my Blackjack and now goes on sale in about two weeks, I would qualify for a refund of the difference in prices? If so, I'll take my phone as soon as possible, but if I can not wait then I go outside a couple of weeks.
They will not let you do that normally. However, if you have an ownership for a representative who knows?