It's a pretty average price. Adventures in Homebrewing has similar deals at times. Their NEW Chinese-made kegs went for around $75 a piece a few months ago, again during a special sale.
Make sure they are REAL ball lock kegs and not converted pin locks. Pin locks are wider and a bit shorter, fewer fit in a keezer. Also, the lids should be real ball lock lids and have a manual release PRV valve. The old pinlock lids have a PRV under a dome, so you need to vent the keg with a loose quick disconnect on the gas post, a bit of a hassle when purging.