I have just managed to buy the diecast tractor unit off ebay here in the UK for just under £35.00 (about 47 US dollars). Not been able to track the trailer down yet. IXO are a Spanish company and have their own web shop if you are still interested. Not seen any kit versions here of this truck but I do have a Revell Kenworth K100 and Mack R series both in 1/32nd scale. The Mack I tracked down from a model shop in Utah about 10 years ago called "Great Models".