if you've already got batteries, maybe a sigelei 30w or cool fire 4. if you don't have batteries and want something with built in battery, the istick 50w or istick 30w. the 50w is $35 for black or silver, $29.99 for pink or blue, and 30w is $24.99 for black or silver, and $19.99 for pink or blue. i just bought a 30w pink one today for a friend. they can be hit n miss on reliability, but my 50w has been used pretty hard daily since April and still works like a champ. i've been chain vaping RDA's and RTA's on it with no problems.