over the years, i have bought several 6AL's at swapmeets for $5-20, that have worked great ! i know that doing this is a gamble, but i'm guessing the original owners don't know how to troubleshoot electrical systems.
at present, i have three on the shelf. as there are many RTR setups out there now, i don't know if these will ever get used, but they don't eat much.
and just yesterday, i found a NIB pro comp type big block distributor [with the chrome cover over the GM HEI unit] i paid a whopping $15 for at a swap, i had completely forgotten about. not sure if it's a b or rb unit. [i didn't measure the shaft] on the shelf it goes ......