I was able to get into the GX pretty quickly. I set up links to scan nationwide inventory. Once I found what I was looking for all it took was a phone call and some persistence. The initial GX I called about ended up being sold but not picked up for a long time. I kept calling until it was out of their inventory. As soon as I hung up, the dealer called me right back and said they had another one inbound and if I wanted it. Well, you know the answer from the first sentence.
Here is one of the links I set up. It allows me to search a 500-mile radius.
Lexus Inventory Search - FL(32305)
11 clicks later and I search the full reported inventory in under 2 minutes.
If anyone is interested, I will post or send them to you.