There are no reasonable priced, dependable, .22lr DA revolvers out there. A good deal on a new S&W 617 is $680. Used S&Ws are hard to find and mostly unaffordable. They have become HOLY relics of the past. They are "PINNED and RECESSED". Now say that again with awe in your voice. S&W fans will pi$$ and moan over the present lack of "fit and finish, the use of MIM parts and the cursed lock". Modern S&Ws are no good. Ruger SP101s in .22 lr, are VERY hard to find. If you find one, it will be priced on the north side of $600. The sights may not be too good, but the SP itself will last for several lifetimes. I've nevereven seen a Colt DA, .22lr revolver.
Avoid the newer Charter Arms DA 22lr. They look good, feel good in the hand, but mine lasted less than 50 rounds. Two chambers were striking the forcing cone. At an angle, even. After the 1st cylinder full, ejection was tough and became nigh impossible. Then something came aloose on the inside!
Taurus 94s should fill the void. But, I know of no one who is happy with theirs. Most of them have had to take a trip to Taurusville. That's in South America. Sometimes it takes a long time to get your gun back from them. Then, sometimes, it still ain't fixed. And, please try the DA trigger pull before buying. The grimace on your face shouldn't be permanent. Replacement spring kits help with the DA pull, but then you will become unhappy, due to light strikes.
The buying public needs, they want, a $300 to $400, .22lr DA Revolver, with a decent trigger pull. Most of us want adjustable sights. Barrel lengths of 2", 3", 4" and a 6" target barrel would be desirable. Maybe even a 5" barrel. If the manufacturer will fix it, if it breaks, we don't care how many MIM parts it has.
So, for now the OP can choose a Ruger SingleSix. A Herritage Rough Rider might even be better than the Charter and Taurus offerings. Good luck.