I can't find a set of rims cheaper than $260 including shipping. I've been checking craigslist but I haven't seen anything.
Be patient, keep watching craigslist. Also look at searchtempest, which lets you search multiple craigslist sites. $100 to $150 for a set of 4 used take-off wheels seems pretty common -- and because you're going to mount winter tires on them and abuse them in salt/slush, then scraped/scratched wheels are cheap and a good choice for this use.
Also google the wheel specs for your exact car, and see what other vehicles use the same exact size wheel. I mean the exact specs -- not just diameter, width, and bolt pattern, but also backspacing and offset. (If you aren't familiar with these terms, google.)
Finally, if there is an optional size wheel for your car, which uses cheaper size tires, consider it. For example, if your car came with 17" wheels, but 16" wheels also fit (i.e. if your car came with an "upgraded" larger size wheel), you may find that winter tires in a 16" size are less expensive. If this is an option for you, be sure that your car didn't have some other option that prevents using a smaller wheel (e.g. larger brake rotors). Again, google and whatever internet forum for your particular car will have all the info you need.