DD#1 is outgrowing her existing bike with 20 inch wheels. We are going to have a bike maintenance session tonight where we do some minor maintenance on my and DW's bikes and incidentally see how far we can adjust the existing bike, but realistically we are on borrowed time. I stepped into the friendly local bike shop while I was doing errands today and they suggested a bike with 24" tires. Being a small local bike shop, they had a selection of about a half dozen of this type ranging from $300 and up (not including tax, etc.). Since bikes last essentially forever and kids outgrow this sort of bike, I thought used might be worth looking into. Where should I look for this sort of thing? Is this just a "stalk Craigslist" type thing, or should i expect to stumble across a sstore that sells used bikes?