Appraisers: Best way to locate an appraiser in OKC

[Bob Foglia]

I own a rental that I'm ready to sell and the current tenant is ready to buy a place. They've expressed interest and if it makes sense (no RE commissions, no renovations, hopefully, a quick transaction) I have no problem selling to them... They've been good tenants so I want to give them the first option if it's fair to both of us. Anyway, what's the best way to go about finding an appraiser to come up with a legitimate fair market value.