Off brand upright pianos are so common in the midwest that if anybody will give $50 for them it is unusual. A Steinway prewar upright in perfect tune went for $300 recently, and that was a dealer since no end user person wanted it. Off brand uprights show up 3 times a week in craigslist, often with rediculous prices, but never at Goodwill. I suspect Goodwill and Salvation Army won't accept them as donations. I'm thinking now about a prewar $50 Sohmer upright, one of the premium prewar brands for sale in a really tough neighborhood. But I would have to throw an organ way or something to make room.
But, moving an old upright is 4 men and a truck if there is as much as 1 stair. Costs about $250 over a short distance, so if it is in your house, and the keys don't stick badly, keep it. Enjoy it. They can be really great instruments for music of that era.
I tuned my 1941 Steinway console myself, using a Hammond H100 organ as reference. Wear safety glasses, occasionally strings break (although mine didn't). You do have to bring them up gradually over several days, to avoid breaking the strings. The Steinway hadn't been tuned since 1966 and was waaay flat. Toy keyboards are often $15 at charity resale shops, these can also serve as an inexpensive pitch reference. The final octave may be a little out because they have "stretch" but you can get pretty close without worrying about it. I think the H100 organ I used as reference has stretch, it was built to duet with pianos in churches in 1966. My top octave turned out really nicely after syncing to the organ, versus what I had by trying to put top octave unison with the middle octave.
To tell the truth, I rough tuned my sister in law's import piano last pre-Christmas season, using a tuning fork for a guitar (D) and the rule of fifths. Took about 2-3 hours a day for a couple of days. It hadn't been tuned in 15-20 years. Got it close enough she could call a pro in and get it finished in one go. Played some Christmas songs right then and nobody complained. I'm they only trained musician in the family, anyway.
Tuning keys (square peg tool) are available online, as are tuning forks. You could buy dampner sticks for the 3 strings as part of a tuning kit, but if you are only doing one piano you can pluck the strings individually without destroying your fingernails too much. Get a couple of rolls of nickels to hold down your reference key after you play it, and your other key that you are tuning.
I'm so sick of other piano forums, the answer to every question is "call in a trained piano pro". If you are a pro player, fine. If you have an important job and work 100 hours a week, fine. If your parents are rich and supporting you, fine. If the piano is an important rare antique, fine. If you're part timing or unemployed, making an attempt at improving your old used piano so it doesn't hurt so badly to play it is cheap entertainment. Then you can practice and build your skills while you have time, before a real job takes you away from your life.
If you have one or two sticking keys, a retired piano salesman tells me the mechanically astute (I'm an ex engineer) can disassemble the action, squeeze out the felt bearings and sand the rubbing parts, without a lot of danger. I've one sticking key on the 1941 Steinway, am working up the nerve to deal with it this winter.
The biggest no-go on old pianos is mouse damage or excessive wear on the hammers and dampers, or mouse eaten return leathers or something. Warped hammer shafts is also a sure sign of go look for something else. There are too many old uprights to mess with either of those.