I've had good experience with Adorama, both used & new; plus they ship chemicals, unlike B&H. Only complaint is their shipping prices are higher than B&H. Except for one transaction, my experience with eBay has also been positive.
I do all my ordering via internet with no problems - don't have to deal with arrogant salesman. The fact that only local camera store is going digital re-inforces my internet usage. Kind'a funny that a digital media has enabled me to more-easily pursue non-digital photography.