Awhile ago I needed to throw some GFCI's in the house and was just amazed at the prices. Found this website where they were at least half the price of most other places I looked. $5 shipped is tough to beat. Am doing more remodeling and am in need of some recessed lighting. Sure enough, same type of pricing compared to the Home Depot/Lowes market and pretty much every home products site I've seen. They also have free standard shipping If you're doing some renovating and remodeling, this is a great place to look around. They also seem to constantly be expanding their offerings as well and will send you small catalogs every so often (not obtrusively so). Products are good quality and the lighting are the same models I've seen in the stores.
Main website: http://www.kk-lite.com
Recessed lighting : http://www.kk-lite.com/p/recessed/index.php
Under $11 for 4, 5, & 6 inch IC/non-IC, new construction/remodel lights with trim plate.