Wyo. Stat. Ann. § 40-14-259

(1) The agreement with respect to a consumer related sale may provide for only the following charges as a result of the buyer’s default: Reasonable attorney’s fees and reasonable expenses incurred in realizing on a security interest;

(2) Deferral charges not in excess of eighteen percent (18%) per year of the amount deferred for the period of deferral; and

(3) Other charges that could have been made had the sale been a consumer credit sale.

(4) A provision in violation of this section is unenforceable.