are you looking to order equipment or live stock.
for equipment you cant go wrong with drs. foster smith. they have great customer service although i have heard their prices r a little bit(few dollars) higher on some products but ive heard that they more than make up for their price with their great customer service in case anything gets damaged or anything like that while being shipped. also wth $5.99 to ship your order no matter how long is really nice too
for fish i have heard great things about liveaquaria(drs. foster smith sister site for livestock)