I've used wiggle and ChainReaction and both have provided great service. Wiggle sent me a saddle in 4 days which thought was pretty good for a parcel from the UK to Australia...quicker than sending a parcel from one side of Sydney to the other.
Wiggle have an option to buy from them in dollars...not sure how that would work for you in the USA, but may be worth exploring too.
Actually, I haven't heard anything bad about any of the suppliers mentioned.