You could try your own, which allows you to customize everything to your specific bike. Here are two variations I've used for a between-the-arms setup. The first has a bottle cage zip-tied to the aero bars, the second has the bottle directly attached to the aerobars using velcro strips. In both cases, I simply drilled a hole for the straw and bought flexible tubing for the straw itself (plain tubing you can get at home depot, or replacement tubing made for hydration packs). You can also rig it to hold the straw down out of the wind, as I've shown, by buying little straw clips that are made for Camelbaks.
