U.S. elementary schools administer reading screeners to identify students in need of remedial instruction. However, the administration of additional assessments comes with a cost. It is unclear the extent to which multiple types of reading screeners warrant the increase in resources that could be used for instruction. This study compared cost--accuracy ratios for three types of reading screeners in Grade 3: curriculum-based measurement (Acadience), computer adaptive assessment (Star), informal reading inventory (Fountas and Pinnell Benchmark Assessment System), and the cost--accuracy of using all three in conjunction. We used classification and regression tree analysis to identify local cut-scores and identify how measures could be combined to maximize classification accuracy. Results suggested that oral reading fluency score (Acadience) yielded the best cost-accuracy ratio, but the combination of Star and oral reading fluency identified important instructional groups. Cost tables provide additional insight to schools on critical decision points for choosing and implementing reading screeners.