Which powered Convoy are you refering to? Diaclone, ehobby/reissue, powered commander? Also in what condition? Diaclone there are three types: Normal (grey plastic trailerbed) Mekki (white trailer side panels w/ chrome bed) Dlx Set. (mekki trailer w/ red mirage & black sideswipe) Normal MIB C10 is probably like 2,000 (highest) Loose but complete w/ powered buggy can be anywhere between 500-1000 Mekki MIB C10 is probably around the same Dlx set. GL 5k+ easily Reissue/ehobby verion will probably cost you around 300ish. There is also a WST powered convoy. I have one. Powered commander is around 120 for the trailer. blue cab is custom.
My Reissue set me back $350 just a couple of months ago... It may seem expensive but I just luv my Diaclone/Microchange!
Is it possible he means this guy? Shmax - Package Details If so, it seems that it's going to be a tough find on eBay at any price, as it hasn't made an appearance in more than a year.