Just an idea for you if you have no interest...

Just cut the pipes off and put them on Ebay as "scrap"...

2 scrap Catalytic Converters recycle platinum 13.3 #'s - eBay (item 160397051668 end time Jan-25-10 14:58:18 PST)

Much easier to ship, and I'd expect the final selling price to be near the same as what you're asking for everything...with a lot less headache.