I bought a pair of Rudy's (Rydons) with the Rx insert, and I've been quite happy with them. Because I normally wear progressive lenses (bifocals for vain old guys), the lower part of the insert has the reading lens as with normal bifocals. This works well because you are normally looking ahead through the top of the lenses, and looking down at the computer requires a very obvious shift in focus.
I probably could have gotten by without the bifocals, but I was concerned about being to read cue sheets with fine print, etc.
I went through Sports Optical (sportsoptical.com). Not cheap, but very knowledgable.