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Accurate payment for the acquisition costs of drug products dispensed is an important consideration in a third-party prescription drug program. Two alternative methods of estimating these costs among pharmacies were derived and compared. First, pharmacists were surveyed to determine the purchase discounts offered to them by wholesalers. A 10.00% modal and 11.35% mean discount resulted for 73 responding pharmacists. Second, cost-plus percents derived from gross profit margins of wholesalers were calculated and applied to wholesaler product costs to estimate pharmacy level acquisition costs. Cost-plus percents derived from National Median and Southwestern Region wholesaler figures were 9.27% and 10.10%, respectively. A comparison showed the two methods of estimating acquisition costs would result in similar acquisition cost estimates. Adopting a cost-plus estimating approach is recommended because it avoids potential pricing manipulations by wholesalers and manufacturers that would negate improvements in drug product reimbursement accuracy.