Sorry to shill (is it possible to shill FOSS?) - BitLocal will help you find local merchants. It uses the BTC Map API, which gathers data from OpenStreetMap. If you want to contribute, check out BTCMap.org to add local businesses to the map.

You can download BitLocal at the link below (free, with no user data collection or revenue strategy). Just wanted to build something for the community. It’s new and is missing some obvious features, but more will come.