Item C is particularly tricky, we just interacted with a friend that purchased a commercial building from a bank at auction, he thought he was getting a great deal and banks are not forthcoming when they are selling at auction.

Open houses, listed properties, wholesalers deals, from you own marketing, auctions, and especially other investors deals if you can get them to show you.

Last year I bought a SFH at auction that was on a large 0.75 acre lot.

Auction Site #1: no auctions until 8/31/20202.

You can buy at foreclosure auction with cash as well( Though this is much more risky proposition and you need to do your homework.Ultimately this option gives you the most flexibility and doesn't put burden of an expensive hard money loan over your head. 

Is it possible to go to auction with a hard money lender

We look at foreclosure auction sites, MLS, online auction sites and we have a couple of brokers that we work with.1a.

Your Ira has to foreclose and most likely have an auction for the amount owed.

Until you have looked at 100 houses, you don't really know your market.That means all kinds of properties; listed properties, open houses, auctions, wholesalers deals, your own marketing, FSBO, and most importantly any deal another investor will let you see, tell you about how he or she found it, and the numbers behind the deal. 

MLS, county auctions, HUD.