Bing Lee discount coupon - $50 off a Garmin Nuvi 1690 (010-00822-20) GPS - $519.
The $50 off voucher brings the Bing Lee price down to $519 which is good. Being a fairly new unit the selling price elsewhere is still around $550 upwards.
Garmin also offer the current map guarantee such that your first update (if within 60 days of buying) is free. Subequent updates are either at a once off price or lifetime subscription. The once off price is 50% of the lifetime subs but I cant see why you'd need to update the maps more than once.