[MENTION=139342]jsohn[/MENTION], I think the number of people wanting that type of config is extremely small. I'd think the vast majority of people who'd want a touring (or hybrid, mtn, road, etc.) would also want the range and light weight of a derailleur based gear system. There was an increase in people riding hybrids as daily bikes throughout northern Europe about 10 or 15 years ago but according to the bike shops I talked to this was short lived and people went back to Dutchies for their daily ride.

SRAM (and I'd guess Shimano and others) are working on a higher performance IGH for mountain bikes but I'll not hold my breath as I think the design difficulties may be impossible. For those who do want them I'd think any Trek dealer could order one like you have.