I don't know how much equals big investment to you but it isn't compared to what you are talking about spending for mixed stuff. The liquids you would need for 100ml would be about $16 add about $5 for shipping (plus that is enough to have some leftovers for future. A syringe and 18 gauge needles at tractor supply less than $5. If you have kept empty bottles you don't have to buy those.
I just mixed my first test batch today. I ordered higher quantities than just mentioned but not near the quantities some here order. So for me it's about $1.07 for 10ml. If this works out I'll increase the quantities and could easily drop that down more.
You can vape as soon as you mix if you need it but steeping is best. I have to wait until next weekend to know if my mix is just tolerable or great. If I didn't have enough to get me through I'd tear into it now.
3 weeks from ordering to opening your first batch.
That's really not that bad...wow. I would like to try it but at the moment I'm just happy sticking with good deals and such! When I'm ready Imma give it a whorl!