Just bought mine. $18.46 after shipping. A very reasonable price in my opinion. I actually haven't seen this yet, so I'm excited. I've heard nothing but positive reviews.
I've read Padres Essential by Bill Center which only briefly talked about PCL days. It looks like Bill Swank (A big part of this film I believe) has a book called Baseball in San Diego: From the Plaza to the Padres regarding early padres history; I might try that next