converters

I resell used converters. In order to estimate the cost of a catalysts, I use a several sites. ecotradegroup.com catalyst.by fso.hu catalog.mairec.com katalizatorychrzanow.pl/en But all these sites are incomplete. Many positions are missing. Who knows other sites with prices for catalysts?

I have these 45mm 4-5 stud converters bought from Driftworks and used around 6 drift days. all nuts included. £90 plus post I also have a pair of 25mm 4-5 stud converters, with no nuts. £60 plus post sorry no pic yet Both sets for £130 plus post..