Where to buy: Extra Tripod Collar for Tamron lens

[NateS]

Hey everybody. I sure wouldn't mind having a second tripod collar for my Tamron 180mm f3.5. I'd like to start trying some natural light shots, but my flash setup is attached to my current collar and it's too much work to take it apart just to mount the setup on a tripod. So, I would like to purchase a second tripod collar to leave the quick release for my tripod mounted to. I have no clue where to look at and there's nothing on Tamron's site or on B&H Photo Video

Hopefully somebody from B&HPhotoVideo or Adorama will see this and let me know if this is something they have but not listed on their site....or somebody else has info??