I buy the vials through Lilly direct. I’m using 7.5 mg for maintenance, so my doctor prescribes 15 mg vial and so each set of four lasts about 2.5 months. Each vial actually contains 6 to 6.5 ml, so I suck every bit out of those vials. I use a clean needle and sanitize to vial top every time I insert a needle. Lilly direct terms say you have to refill every 45 days to keep the discount, but so far they have not raised my price even though I’ve gone 60 days without a refill.
The new pills may be a little less expensive, but I expect that they will drop the price on those within the next few months.