Browning.com has sn data under customer service.
Most go for about 375-450 simply because you can get one from a store for 500. I would recommend asking 475 and accepting as low as 400 if offered.
50-500 usd
Never heard of a model 22 BPS. A Browning BPS in 20 gauge can vary from 150-400 depending on condition.
32 year old BPS in 12 gauge.
50-500 usd
100-1000 usd
Browning Pump Shotgun "BPS"
100-700 usd
1991
1990
Starting in 1983.