This deal has ended.
Amazon has cut the price on the TomTom ONE XL 4.3" GPS Navigator to only $159.99. With free shipping, this matches the best deal to-date. It's even better considering they are selling the refurbished model for $199. The TomTom XL (this is model 1S00.080) comes with turn-by-turn voice instructions in the US and Canada and has a built-in bluetooth connection. There is no sales tax (except NY, KS, ND, WA).