aw, first of all i just want to say you're so creative to think of this way to help your parents out! Tough times like this, everyone needs a little help.
But I'm sorry, i dont know where you can print them for cheap. BUT what I would do is get some pricey photo paper..or fancy paper and print it out yourself then sell it. Even though the paper can be a tad pricey, but you'll profit from it at the end. Try selling it on Craigslist.com or EBay.
good luck.