I just took a look, and found only one type in stock: SB1-S35 , for $270.00. This is on a SB1 frame as noted from the stock number. This frame is for shotgun and low pressure centerfire barrels such as the 357, and 44 mag.
They showed a combo 20 ga. and 357 as out of stock, but it also was an SB1 frame.
Welcome to the forum. Spend some time in the FAQ's and you will understand the difference in the frame types, as well as learning all the "inside" knowledge of these fine little guns.
Ben