I've looked into buying liquid online, but it's tough for me, since I'm rarely home. Also, I'm not sure if it's legal to do in Canada now after the recently passed law. Maybe I can buy from Canadian companies, but I doubt I'd be able to "import" it. I'm perfectly content with picking up the liquid wherever I'm at. Although, 120mL for $20 bucks sounds amazing. I think I spent like 32 bucks on 30mL yesterday, but it is by far the best juice I've tried.
Everything I've read about the eleaf is that it's good. The only thing that may cause an issue is using it while it's charging, or using too low a resistance coil and shorting it.
Looked into mech mods, and I think I could easily build one myself. Just need to figure out the ratio of #of coils to resistance. From what I've seen so far, it seems like 5 coils will give you between .5 and .7 ohms, but before I get into that, I want to start doing some rebuilds on coils. Right now, it's just really convenient for me to use the prebuilt coils given the amount of travelling I do.
Also, I've noticed such an improvement in taste since upgrading to the subtank and istick. That and the cooler hits are making it really enjoyable.