This deal has ended.
Amazon has the new Oral B 7550 Professional Care Power Toothbrush available to pre-order (it will be released on 9/21) for only $37.95, despite a $100 list price. This is as good a deal as I've ever seen for a brand-name electric toothbrush. The 7400 has been selling for $70-$80 so don't expect this price to last through its release. Shipping is free and there is no sales tax (except KS, ND, .WA).