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I haven't found any at less than about 75% of new (mostly Belle) which doesn't sit right with me, given (assuming) the warranty is not transferable and will at least be partially expired. Belle mini mix 130 is 300 at Toolstation and readily available so will probably just go with that and hopefully sell for c.£200 when I'm done with it.
The only other option is the B&Q 'build buddy' which appears to be identical to the Screwfix one but neither keep spares so I imagine resell value isn't as good.
By second hand & sell on - they keep their value pretty well, if you keep it clean.
I had a Belle Mini Mix 150.
Until it was stolen.