While you are waiting... set up your account at BN.com. Then you can snag whatever free books are offered while you wait to buy your nook and have them in your online library ready to go.
You can grab 12 of the BN Classic series until Tuesday.
http://www.bn.com/freelibrary
I don't know about price drops, but my rather CHEAP hubby, after we'd waited until the prices fell to the $149 mark for Nook WiFi, said he'd enjoyed his so much, he now would've been happy to have bought it earlier and paid the higher price! That's REAL unusual for him...