The key to buying a GPS is to make sure it has a lifetime upgrade package with it. Otherwise, you have to pay for upgrades. If you got a steal, that might make the price jump up in the long run.
Amazon.com has the TomTom XXL 540TM 5-Inch Widescreen Portable GPS Navigator (Lifetime Traffic & Maps Edition) for only $99.99 with free shipping! This is regularly $199!
