how are these properties starting so low e.g. $100?

[Nehel Khanani]

Forgive my ignorance - newbie here! - but how are these properties starting so low? e.g. $100 

https://www.xome.com/auctions/16540-Southwest-37th...

There are quite a few on xome. They're foreclosure trustee sales so I trust I'll get a warranty deed. Or am i mistaken to think that and are these quit claim deeds? I'm from northern california so anything below 100k elicits a 'wow!' from me but this, seems unbelievable..

At this price, it's worth a trip to FL?