There is no official alternative to Qubit Flex Assay Tube Strips (Cat. No. Q33252). Some Qubit Flex users have had success with MicroAmp Optical 8-Tube Strips (Cat. No. A30588) and Sarstedt 0.2 mL PCR tube strips (PN 72.991.102), but we do not guarantee their performance. Sarstedt 0.2 mL PCR tube strips can be ordered from FisherSci (Cat. No. NC1880432) or directly from Sarstedt.