www.dddhouse.com - probably some 20+ orders with them and never had a problem.
www.dvdasian.com - large inventory, prices a bit high, but they are located in California so I get my stuff in 2 days.
www.ethaicd.com - awesome place. LOW prices, and I usually get my dvds usually in a week. Around 10-15 orders with them and never a problem. TIP: Make sure in the description it says ENGLISH subtitles or else it doesn't have them. Their stuff is the Thai versions (Same as HK just added Thai subtitles or dubbing as an option). For instance: The THAI version of Azumi is probably the best version out there on DVD and its only like $10 (including shipping) at ethaicd.