That's a reasonable price for any new SB2, SB1 357s sell for a little less usually, Bud's sells the SB1 for $209 shipped for comparison. Are you sure it's an SB2? Just because the barrel says SB2 doesn't mean it is, the SB1 will have a statement on the right side of the frame on what barrels can be fitted, other than special orders, which Gander does, the SB2 357mag was only available with a wood stock.
Tim