Dark and drone in the same sentence, as far as I'm concerned, Loquelic Iteritas is king of my castle. Not exactly the same price, but you may be able to get one on the 2nd hand market: https://www.modulargrid.net/e/noise-engineering-loquelic-iteritas
The Cursus Iteritas might also be worth a look if you want to stay in the realm of wavetables, although its of course the Noise Engineering take on it, not your typical VCO.
That being said, the LI only made me hungry for its amazing Percido version, but that's another budget... :-)
All the best,
D.
--- Voltage control all the things ---