I can't get those 5 hours back that I spent working on the line-art map (post below), but finding this vendor on Etsy may make up for it! $20 for a custom map? Done. Here is a sample of elanink's work:
I hand drew a map a few weeks ago, but I'm not sure that I want to include a 4-color insert with the invitations. I may have to check out this vendor!