Hi Jake,
I took a look at the Salt lake City Craigslist, didn't see much too offer, mainly mountain bikes. What did catch my eye was an ad for a Bike Swap/Expo at Utah State Fairpark coming up on March 5th. I have no idea where that is in relation to your locale and what they exactly have to offer but it might be a good idea for you and the wife to go. It could quite possibly give you an opportunity to look over different bikes and sizes to get a feel of what size is a good fit for you and your lady. Also a chance to make some contacts with local C&Vers that might help you in your quest.
Bike Expo/Swap
note: Being in SoCal, I am not affiliated with this group in anyway, just passing along some possibly helpful info.