As snow performance won't be much when the all-seasons wear down below 4/32", I'd avoid the used tires.
I don't know your sizes, but I managed to buy a set of new 17" Conti Extreme DWS tires last year for around $600 out the door for my 128i. Dry & wet grip, handling & ride are easily equal or superior to the OEM summer RFTs and although I garage the car in winter, other folks have reported very good winter performance.
Why don't you check these tires out on the Tire Rack website?
Tom
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