Best OPK and where to buy???

Christina • Happily married and pregnant with BABY#1

Thinking ahead for January's cycle about starting to use OPKS. Jan will be our 8th month TTC. Would like some advice on which ones people like the best and where you purchase them.

My cycles are fairly regular so hopefully it will help me pinpoint exact dates instead of just looking at the whole week. Wanna try a few things before the 1 year mark is up and we have to see a specialist if we dont concieve. Thanks in advance and good luck everyone!