I found a great place for gears that's got exactly what you're looking for. Here's a link to their page. They have one of the best menu driven selection processes I've seen at online stores. You just select by your shaft diameter (1.5mm) and whatever other parameter you need and you'll end up with the exact thing you want. Quick delivery to. They helped me out on my project and I'll definitely use them again.
http://www.sdp-si.com/eStore/CoverPg/Gears.htm
That's the page to select the type of gear you want, not the home page. You'll probably want one of the top two categories, most likely 'gears' but you might want to look at 'timing belts,pulleys,sprockets and chain drives' as well. Anyway, they've probably got what you want.