I bought my 4" Elco Title 24 recessed lights at electricsuppliesonline.com They had great customer service on the phone as well since I was not that familiar with which ones I needed.

I didn't end up buying mine online. I found the cheapest online price and my local Lamps Plus store matched it.

When I purchased mine, lowes and hd beat all online prices by a few bucks. These were Halo's.

We purchased our under cabinet (nice fluorescent slim line design) & low voltage can lights at HD, they had the best price. We didn't exactly follow the Title 24 rules for the amount of fluorescent but we are happy anyway. Good Luck!

i buy all my recessed light fixture from usalight. Have been very happy with their prices and service. slight problem was that their 4" cans are a tad larger than my 4" hole saw so i have to always trim excess dry wall by hand... otherwise great prices...

I don't have recessed lights, but I have ordered other lighting successfully from lightingonthenet.com and thebrightspot.com.