Follow the Ebay listings and contact the sellers of the bikes that don't sell because the reserve or the BIN is too high. You'd be surprised what some people will do.

In this instance, the group I got was a take off...the guy had been gifted a bike and had just switched out the Record group and put DA on it. He was selling his older bike when I emailed him. Came up that he had this group laying around and wasn't sure what he wanted to do with it...so he sold it to me. Purely luck but that's what it takes...lots of casts to catch a single fish.

55/Rad