The SP101was made in 22lr, 9mm, 327 Federal Magnum, 38 and 357. They discontinued the 9mm and the 327 Federal Magnum, If you can find one in these two calibers you can plan on spending in excess of $800.
If useing an SP101 for conceal carry buy a good holster and a good gun belt, these are solid stainless revolvers and are heavier then most of the Smith & Wesson J-Frames. I have several SP101s, Gp100s and Smith J-Frames. My main carry gun is a Smith 642 - 38+P.
The Rugers are great guns at a very resonable price from certain gun dealers. Some dealers are a little high on the prices so it pays to compare prices.