If you are looking for a good deal on a power toothbrush, you can get an Oral B Professional Care 1000 Power Toothbrush at Amazon for $34.99 minus a $3 off coupon you can click just below the product picture on their site (click the box to the left to see the product and info). Then you can print a rebate from Oral B that will give you 50% back of your amount spent, making it a $16 power toothbrush! Go here for rebate form. The toothbrush gets 4 1/2 out of 5 stars on its reviews on Amazon (and it has 201 reviews!), so it must be a decent toothbrush!
***Update: It's now sold out at Amazon. But if you find a good deal on one of the brushes listed in the rebate, you could still get 50% off back in rebate.