There are currently SEVEN guild hall lots available to guilds.
Okay, since the good news was first, here is the bad news:
The price for buying a lot has gone up from 100 points to 200 points. This is to make sure that a guild that buys a lot is actively recruiting and playing for a decent amount of time. Hopefully this will result in less purchased but empty lots littering Valorn belonging to somewhat inactive guilds.