That's a good source - but really it's only worth what someone will pay for it - regardless of "value". The rimfire BPR's were made by Miroku (Japan) for Browning, so you don't have to worry about the whole Belgium-made-or-not thing like some other Browning guns.
They are nice rifles. I've only fired the .22 LR model, not the mag, but the one I shot was a quick cycling, accurate rifle. A touch heavy compared to some other rimfires, but that made it not feel like a toy, but a real rifle. If it was in great shape and you really want it I don't think I'd go higher than about 500.