I usually pay about $45 a cart and they last me about a 2 weeks but I use it almost every day. They are just an easy and desecrate way of using that keeps the smell down too.
$60 retail with frequent 10 to 20% discounts from reputable dispensary. fucking awesome... 100% safe with no additives and if something goes wrong there is a company with over 1 million in holdings you can sue. each cart lasts for a very long time.
if you're still smoking bud you're in the stone age my dude.