Bulk ordering vs by dose?

Hi! I'm in California and would love to learn more from anyone who is going the bulk/vial ordering route. I want to be able to self-titrate (low dose) and keep things cost-effective. It seems that this would be the most viable route. So far, I've tried 3 months (20mg starting to 30 mg now) of compound tirzepatide from a local medi-spa, but it's adding up (500/month). It seems straightforward and I would rather just have the vial and administer this dose myself as I'm going okay with 30mg. Anyone here have experience with the vial route? Thank you so much! I'm so grateful for this group :)