Depending what you’re looking for in a bass synth the Circuit Mono Station could be a good option for you as an analog synth which has 2 Oscillators, Sub Osc, noise generator, audio in and Ring modulation; LFO, Mod matrix, and Mod sequencer which can be fashioned into a second LFO of sorts. It’s got patch storage and pattern sequencing for both Oscillators (paraphonic if you want). MIDI and CV out. Nice analog filter stage with overdrive, LP/BP/HP, and distortion. You can also process audio in through the filter stage. It has stable tuning and is compact, but also has (nearly) one knob per function, and you can record automation in the sequencer for every single control.
A great device for creating and performing live. The resonant filter, glide, per step sound and parameter locking can get nicely into Acid territory and do all sorts of other crazy experimental stuff. Sound lock per step makes it a great analog drum synth too if you want.
I picked mine up new for £249 during a sale.