These are the ones I've been using..
I've been on a mission to find discounted ones. My best source has been eBay. I just won a bid for 2 boxes for $40. Two dollars a strip! I'm giddy with excitement!
I have enough strips for 42 more days. If I can find more bargains, I'll extend my ketosis experiment. It's been fascinating seeing how my ketones react to the carbs I eat. I'm still in ketosis, today the reading was 1.8.
I may research pharmacies in Canada, I hear the strips are cheaper up there.