Good news, everyone!

Good news, everyone!  As it turns out I was able to fix all of the laser tag system's non-working components.  It was a case of cut wires, corrosion, and I'm not sure what else.  I also did a bit of research and realized that the systems are worth more than I had assumed; sets of two vests and two guns are listed for -- and sell for -- up to $50 on eBay.  This means my initial resale value estimate of $20-$30 is off.  By how much I'm not sure; I guess I'll find out when I get sick of wasting batteries with those things.