I bought my ketone strips from Universal drugstore from canada. They run $2 a strip and took about two weeks to receive. They are very expensive, which is the reason why I'm testing every other day at this point. I would order $100 worth to take advantage of the free shipping, otherwise shipping will cost you around $20. If you order the nova max, it comes with two ketone meters and it's free as well, but take 3-4 weeks to receive the meter.
In the meanwhile, you could check your glucose levels. Below 100 in a fasting state is a good sign.
Again, so sorry.