I know you're looking at combos.
But I had a thought that may prove helpful. What about used CABs around you? As well, have you considered a PA power amp? You have a pre-amp, and power amps are possibly more widely available than bass combos in your area. That just leaves a cab to track down, and a power amp can be used for many other things once you get to a spot where more capable amps are within reach.
Also, with a "bigger" power amp you may only need one channel, leaving an open channel for another use, like a PA sub or monitoring.