+1 all of the above
Under .4 -- Sony vtc4 (higher cdr @30A) usually about $7-9 depending on where you go
Over .4 -- Samsung 25R (little better runtime, but only 20A) usually about $5-7
Charger - nitecore i2, cheapest that won't burn you either literally or metaphorically. There are better by far but a budget is a budget lol
Whatever you get, a good rule of thumb is to have at least 3...one to vape, one to charge, one to rest a couple hours after charging before using it again