oops, now that I'm back at work, I checked my order files. The price was actually $402.50 (taxes) and the order date was Sept. 2005. I'm guessing prices have gone up a bit since then but it's still worth a phone call.
oops, I did some more checking and DV Shop lists Panasonic "Master" 60 Minutes in a 5 pack for $37.
Hard to tell from that description if it's the same as what we're using but, once again, it's worth a phone call.