The above route by Minh is a pretty good option, it uses knockoff Hakko T12/T15 direct-drive tip cartridges which deliver more heat than any of the 936 clones, or the ToAuto iron above. The use of an external power supply (usually a laptop one) eliminates the need for a sketchy Chinese internal one. The biggest downside is probably the tip-to-finger distance which will be double a hakko fm-2027. But for casual soldering, that's a killer deal.

For anyone curious, that setup will deliver more power than any of the TS100 rebrands and clones (1up and maclan) and be on par with the maxline unit.