I burn probably 50 incense sticks a week and have signed up for every available sample too without receiving any until recently.
Got some good samples from
http://www.theincenserack.com and went to their site and ordered a bunch of sticks and some of the smoking bottles from them. Great prices - especially on the bottles as I've seen them sold for as much as $24 ea.
I highly recommend this site to anyone who loves incense.
Enjoy!