Wow! I'd like to know how Grandma got all those machines because that's some heavy duty sewing power you've got there. There is a market for industrial machines ( I'm assuming they work) check prices on eBay, craigslist, etc. Since they're "found" machines and you haven't spent anything on repairs, if you don't expect the moon, you may be pleasantly surprised. Please check back and let us know what happens and good luck!