Widge,
I bought Trijicons for my 40 75B. I think I got mine from Midway, but Brownells probably carries them too, and probably Cheaper Than Dirt, as well as several other sources.
If you are not comfortable installing them yourself, any decent local gunsmith should be able to handle it for a very minimal fee. The only real issue is the pin in the front sight. But again, any decent gunsmith should be able to handle it.
If you want you can always send your slide to Trijicon and they can do the install as well as sell you the sight.
Good luck, and hope this helps.
twoguns