Everyone has a unique rent amount within each building, so I always know who paid based on the amount of the deposit - but the tenants frequently ask the teller to include a memo with their name and/or address.  

Court records frequently can be searched online at the court's website either for free or for a nominal fee.

With these reports in hand you can frequently negotiate the price down further.  

And finally if you are small business owner or have some self-employment activity you may be eligible for a truly self-directed Solo 401k plan, which is superior to all both the SD IRA and the Checkbook IRA.The subject on self-directed investing is a frequent discussion in this forum category: https://www.biggerpockets.com/forums/51-tax-legal-...You can do quick search using related keywords and you may end up spending hours reading and educating yourself from all those discussions. 

Buyers and agents are frequently anxious and want sneak peeks, etc, but it's up to me to stand firm and not say a word about what appears on the appraisal report until it's actually signed off, because it's not me that is the person actually signing off on it, so me not noticing anything wrong with it holds zero value.

I should have mentioned I check on the property frequently as it is in my neighborhood.I don't think there are any rules for a "drop-in" -- not entering the property but simply stopping by.

His unit is currently sitting at $375, while the other two identical units which have turned over more frequently are renting for $400 and $425.

But to answer your question, I have frequented the Fannie Mae foreclosure site, HomePath, and realized there's are only 3 or 4 agents who sell those.

Mortgage lenders frequently factor in the COST of HOA dues when qualifying you for a mortgage - but they rarely collect those funds.

I need the info for specific properties frequently enough that I just decided to start paying for a subscription service (I use rentometer.com) to estimate rental comps for me on a property by property basis.