Mod Upgrade on budget help.

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Hey all, I'm looking to go from subvod c device to a better mod with a long battery life. I'm on a fixed income with no give so I need something under $100, significantly less would be ideal. Thinking about getting one with a rebuildable coil option, but want option to buy ready-made coils too.

Advice, tips, and suggestions for the best battery life mods in my price range, *would like to have option to adjust wattage & temp control. TIA

Mod Upgrade on budget help.