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Look for local bike stores that have been stocking a lot of Treks for a few years and pop in, I found a pair last year on my 3rd attempt, I think they came out around 2005, I've only ever found the all black ones though the redlines get bought up by the folks at Ratrodbikes pretty quickly,
edit: If you want the Bonty's for an inbred don't bother the 2.4's don't fit 2.2 does fit but feels slow, I built a 20" Inbred geared (pic in this thread http://www.lfgss.com/conversations/248491/ ) earlier this year but the Bonty tyres felt like crap with the long top tube, to speed it up I bought a pair of Panaracer XC PR 2.1's, I know its a semi slick but rides like a slick and made it so much more fun also really puncture proof and very capable for riding dry off road
THey look cool, I just can't seem to find them.