I ordered one a couple of years ago from Midway. They say that they are "temporarily unavailable" right now. Are you on their "notify me" list?
If you are on the list, they will send you an e-mail when they have them back in stock.

Smith & Wesson Cylinder Assembly S&W N-Frame Model 625 45 Colt (Long

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Ret. LE, FA Instr, S&W Armorer