This is not an endorsement for Couchsurfing but with millions of followers; it is worth a look - sleep on someone's couch for a few dollars.
At first, I thought it was for young adventurous folks, but I now see eighty-year-olds using it. An eighty-year-old American lady was cycling through France.
I'm planning a trip to downtown Boston, and the hotel rates are, well it makes you reconsider. Airbnb I've seen offerings for a
couch in Boston via Airbnb also, but Couchsurfing goes one step further by having fellow "couchers" meet up when they are in the same city.
I might try this for one night when my adventurous mode kicks in who knows there could be hidden opportunities in this niche.