Max out your tire size. Like big fat tire style. You can sometimes get really big tires depending on your setup. Schwalbe Fat Frank 26´´ x 2.35 was the biggest I could get and they where great.
Let some air out for snow. Works especially well with packed snow and ice.
Probably not as good as studs, but works for me.
I honestly thought you were meaning to give them trash. I never feel bad about dropping off old furniture and junk at chain thrift stores making profit run by wackadoos. Dropping off after hours saves me a trip to the dump. Much cheap for me too.