I've labored over homebrew spreadsheets and online sources for a couple of days, including Dave Meyer's Total Return calculator, to no avail.

That is online with what we’ve been paying when we were able to find help.

Networking, local meetups, door knocking, mailers, wholesalers, online forums specific to your area of interest.  

It will be easy for you to check if they paid on time, as you can check instantly online.  

Quote from @Zach Howard: Quote from @Jonathan Greene: If you are looking at properties in the US only on Zillow, and not seeing them in person (I know you are in Hong Kong), this is just an effort in futility because you can't underwrite single-family or small multifamily deals only online.

Quote from @Michael Smythe: @Tuan Tran don't fall for all the hype about S8 by so called online "gurus"!

I would never form an entity with them when I can do it online with a firm that charges a fraction of what they charge).

I also recommend a bank that has local branch that you can go into vs having it 100% online.

Quote from @Jeanna Lichtenberg: Did anyone sit through the free online "live" webinar?

This listing is posted via NY State MLS #11234668 and shows up on Zillow as well as other online sites.