+1 on Cams post, and for the most part, the others as well.
If you are really really broke and absolutely have to drive, and you have 2 good snowies, well,put em on, but know that your braking will be effected, and if you get loose going around a corner(hit the brakes mid corner, take the corner too fast, have to correct your line mid corner etc) you will spin out and probably hit something.
Look online for used snowies and just inspect them well before buying. I have a set of great snowies on the Galant. They will go anywhere, they are lasting really well, and they fit perfect. I have had them for 2 years, and will get at least 2 more years out of them. They cost me $100 for all 4.
I mounted them on the stock wheels and now, I can put them on and take them off whenever I need to, and not have to mount and balance each time.