Bought my Ruger SP101 for 550 new! 2.5 barrel!! Add 50 bucks or so for the longer barrel!! I always think its better to pay a few more bucks for something worth owning than to settle for something you will be unhappy with!!
If you want an inexpensive .357 Magnum Revolver the Taurus and Rossi's come to mind.
SOme are under 400 dollar.
There is also EEA which makes its handguns in Italy and the former East germany supposedly to decent quality for the money.
Thier 357 revolvers go down to 300 USD..
The things with Reolver sis you dont seem to get a big dicount for a used one..