Where can I find the cheapest washer and dryer?
You can try yard sales or Craigslist
Don't go to Best Buy!
If you want to compare with the full variety of choices you should go to: http://tinyurl.com/czxbr5e
Right off the bat, look for Roper machines. They used to be one of the best, least expensive mfg of washers & dryers. Basic & well-running for the money. (But still compare, just in case I'm wrong or things have changed.)
Buy second hand
eBay, Craigslist, or garage sales ( but they may not work!)