Not as cheap as $99 and it's a self-created do it yourself deal, and I used it to buy the refurbished nook which is no longer available so I'm sure it works but it's a little complicated, and it takes a while to realize the discount but here it is:
By 12/6 - Log on to e-bates or create e-bates account. Connect to B&N via ebates and buy $150 +the tax you'd pay in your state in e-gift cards if buying the wi-fi or if buying the 3G/wi-fi buy $100 in e-gift cards. You'll get $12 or $8 in rebate and a $10 e-gift card (not delivered until 12/26 so this can't be used to buy the Nook). Log off of B&N and e-bates. If buying the 3G log back on to e-bates and connect back to B&N - create a second B&N account (using a second e-mail and cc) and buy a second $100 GC + the tax on the 3G Nook. You'll get a second $10 e-gift card and a second $8 e-bate.
Once you have your $150 or $200 of GC log back on to e-bates. Connect to B&N. Buy the Nook using the GC you have purchased. You'll get a second e-bate = to 8% of the purchase price of the Nook + the tax you pay.
Total savings on a w-fi only Nook $24 plus a $10 e-gift card. Total savings on a 3G Nook $32 plus $20 in e-gift cards.