through the course of my turbo3 build i have used this merchant as a good source of silicone hose couplings, bends, and clamps. they also have a great selection of intercoolers, heat exchangers, bovs, and turbo related accessories.
one of their customer service reps, meredith, is very responsive and helpful. they have their own retail web presence as well as ebay sales. silicone intakes seems to be a sister company with some overlap of merchandise.
they have competitive pricing and fast delivery. i recommend them.http://www.frozenboost.com/