I posted this in road bikes but mainly was just getting advice about where to buy Sora shifters, so I bring it to you. I noticed today that Walmart carries a GMC Yukon road bike ($300) that has 7-speed shimano sti shifters (but they are not sora). Shimano doesn't have them on their website and I was wondering if anyone knows if and where these can be purchases (I'm assuming they would be cheaper than Sora). I think Walmart's website lists them as Shimano Tourney, but I assume they're referring to the derailleur. I looked on Shimano's website and they're not there, so I'm just wondering if anybody knows how to get these, or if they are just something Shimano produces especially for the place that makes the wallymart bikes.