http://www.racerpartswholesale.com/tbolt1.htm I got 2 12" glasspacks from these guys for $25 shipped for my Ford. Of course, they use a louvered core, which makes them a little quieter and also slightly more restrictive, but I just needed cheap mufflers. You can get Dynomax glasspacks at Advance Auto or from
www.summitracing.com for under $20 each. They are my favorite becuause they have smooth cores and also are availible in a lot of different configurations.