I have a brand new set of Portapros, never opened, that I'm looking to trade towards a set of Sony MDR-V6's (aka 7506's). I know that I can grab the V6's online for about $60 and the Portapros go for about $35-40 online. So if you've got a pair of V6's in new condition, PM me and we can work something out.
Just out of curiosity, where can you find them for $60? The only place that I've found that has the V6 in stock is millionbuy and they sell for $70 + shipping & tax which bumps it up to $82. I've found that etronichaven sells them for pretty cheap but someone recently said they ran out of stock (etronics doesn't seem to have them right now as well)