Tru-Glo, Meprolight and Trijicon all make night sights for a revolver, and there may be others.
If you have a front sight blade on your barrel and a file and some epoxy or super glue you can buy reasonable night sights and install them on the front sight of any fixed sight revolver...or have a 'smith do it for you. My experience is that a front tritium sight works very well without the rear sight being tritium. It picks up the front sight right well. It's even easier if you already have a red ramp front blade. A bunch of folks, like LoneWolf.com sell inexpensive tritiums; one set I picked up there was $79 dollars. I put a front tritium blade on an M-642 and an M-40 by filing the front blade out carefully and supergluing the insert into the front blade at the proper height.
"If it can be thunk of, it generally can be did"...