So long as the policy is clear, I don't mind either way. If I had to choose, I'd prefer the conventional "taxes on top" method. Instead of buying preset amounts of medicine and having tax included, I find it more convenient to buy buds like other people buy steaks from the butcher counter: select the best ones in the jar, weigh them on a scale, and calculate the price based on weight. I'm as likely to walk out of a MMC with 3.2g or 5.6g or 9.1g as I am 3.5g or 7g.

Also, the use of both metric (grams) and imperial (ounces) units of measurement is needless and potentially confusing.