Originally posted by D1N0 Well there is the FA 35mm F2 the Sigma 35mm F1.4 and the FA 31mm F1.8 Ltd. And only for aps-c the Sigma 30mm f/1.4 DC HSM Art
These are your options, and none are under $200. Even the super affordable, plastic fantastic DA 35mm, with
only f2.4 is not far from $200 brand new.
OP is asking for a unicorn. IF anyone finds an AF lens around 30mm, faster than f1.8 and under the $200 mark, I'm buying a couple... and Im sure 90% of other Pentax users will be waiting in line, as well.
A used old version (not Art) of Sigma 30mm f1.4 might come closest in terms of fitting all of the criteria. If you can live with the triangular bokeh highlights
One option to consider is the
Samyang 35mm f1.4 - fast, big, not super expensive. But it has no AF.
Kerlee will soon start selling the 35mm f1.2, not super expensive, but again, only MF. And both of these are big lenses.
Basically, these are your only options, the ones mentioned in the quoted text, and in the previous paragraph. None of them fit all of the criteria, but they fit at least some. Good luck.