Aside from the regular MLS such as Realtor.com, here are some options:
HomePath.com for REO listings,
Auction.com (properties listed there are sometimes eligible for conventional financing),
Xome Auctions,
LoopNet (perhaps not the greatest resource but look anyway),
Hubzu although it can be (tedious and confusing),
also check your city or county website for auction properties ( a very few may be eligible for conventional financing),
HUD Homestore (another tedious process but worth checking)
ForSaleByOwner.com (search your area, not all properties listed are on the MLS)
4SaleByOwner.com (ditto)
Craigslist Toledo OH, real estate for sale by owner listings (beware scams, but sometimes good things show up)
Facebook Marketplace for Toledo Ohio, there is a real estate section
Local bulletin boards- post a free ad saying what you are looking for
Bigger Pockets Marketplace!
Look up and contact wholesalers in your desired area to see if they have anything that meets your criteria (many are here on Bigger Pockets to connect with)
If you are prepared to go further in your search, you can direct-mail the owners of any multi-family properties you see that you take interest in, to see if they may want to sell. Sometimes even if they don't, they know someone else who does! There are resources here on BP for how to do that, getting address lists, etc.
Guys, what have I left out??