OPK brands

Sheena • Mommy of a daughter 4.5.10 & son 11.3.18
What is the best opk brand to order on Amazon?? Turns out my cycles vary every other month... One month I'll have a 28 day cycle, next 25, next 29, next 24... So I want to keep track of my ovulation every month but the clear blue can get pricey