ovulation kits

Hey ladies. Where do you buy your ovulation predictor kits, (including the test strips), locally or online?
What brand do you prefer?  I've been using the Walgreens brand, one step predictor and am trying the strips for the first time, during this cycle. 
I've only gotten 2 ovulation positives over the last 4 months using the one step. 
My plan is to try to better time my ovulation using the strips this go round.