Greg, where do you live? If in the US, I have seen elm growing in literally every single State I have visited. That includes CA, OR, WA, UT, NV, CO, ID, MT, KS, NM, AZ, OK, TX, NC, SC, MN, WI, and OH. IT's all along roads and in woods, vacant lots, ditches, riverbottoms, etc.
The issue with red elm sold in board form is that sellers are often not that careful to identify species, so any elm with lots of darker heartwood might get sold as "red elm". If you are buying a stave, maybe ask the guy first.
The good news is that any elm will make a bow, though some species are really a lot better, even the worst is acceptable.