Panasonic 20mm f1.7 for $340 with coupon
If you have a near-term buy-interest in the Panasonic 20mm f1.7 pancake lens, you can get it for $340 with free shipping when you enter coupon code FEBSAVINGS at J&R World. The coupon ends 2/28/13 and it is $10 off an order of $100+ or $5 off an order of $75+. J&R has an optional rewards/loyalty program for regular shoppers (look for it at their product pages).
For a refresher on the lens, check the list of completed Panasonic 20mm f1.7 (m43) reviews.