I've heard good things about Dachiu dragons and A-1. There are a lot of good options available though. If a reptile convention comes near you, it may be good to visit so you can speak with breeders directly and get a good idea about who you're dealing with.
What kind of bugs are you looking for? I get my worms from lindasgonebuggie in Florida. I got the roaches to start my colony from ABDragons. When I used crickets I got them from premiumcrickets in Georgia. If you live in a place where dubia roaches are legal (they are illegal in Florida and Canada) I suggest getting a colony started before you get your dragon because that will provide you with a replenishing food source. They are also much easier to deal with than crickets in my opinion. http://www.southtexasdragons.com/dubia-roaches.html
I got my beard from Dachiu.. I've had him for 6 weeks now and he's growing like a fiend with no issues.
I just started up my dub colony.. But I've been purchasing from kfcfeeders out of Georgia. They're legit, fast, and produce healthy bugs.
I did a purchase from dubideli about a month ago, and will never purchase from them again. 25 % of both the feeders and adults died within 4 days. There were also a couple of fleas in the batch that I luckily managed to kill before they escaped from my garage into the house. Do not purchase from them.