I don't have much from SS, only a Sienna suit and a Havana jacket, but I'm 6-1 170, and 42R is just about right for me. That might seem a little large, but it works out in the shoulders and the length, and the waist is easy to take in.
Another suggestion for eBay. Do a search for "antique tuxedo stud set". You'll get some good hits. If it were me I'd definitely go antique with double sided cuff links. Never settle for the swivel bar if you can help it.
^^^ I sat and thought about that question for a moment and I realized that expensive and cheap aren't concepts that I take into account when buying things. I don't know if anyone else feels this way but my way of thinking is "Do I want this?" and "Is it at a price I'm willing to pay?"
"Is this expensive?" is never part of the thought process. FYI, I have paid $200 for some pairs of trousers and would again.