steamroller forks sell for around $65 and they have 38mm of rake. but they're a tad tall.

for forks with steerer tubes that are too short, it's possible to cut the steerer tube a few inches above the crown, then TIG weld an extension on. it's best to use a sleeve inside that acts as bridge between the two tubes that are being welded. this works best for thredless steerers but I've done it on threaded too.