My experience has been that you need someone who knows how that system works and, more importantly, willing to persist because it's probably somewhat similar to lurking in the reservation system waiting for walkers to drop days.
We have a FL-based guide who sold us direct at WDW twice and has been great overall. But when I told her I'd be open to buying VGC she told me it wasn't available and will keep an eye for it, but it's been 18 months since then...
On the other had, we recently visited DL and did a VDH room model tour onsite. We told that guide we're not into VDH (restrictions) but would be open to buying a small contract at VGC in either of our two use years. In a span of less than a week, that particular guide was able to find two separate contracts in two separate use years that matched our needs (the first one was a bit smaller than what we wanted, and the second one was exactly what we wanted but in our other use year, so we redid the contract) . The reason I got the impression that something similar to lurking was involved was because he discouraged us from trying to split the contract into 25-point contracts and said he'd have to release it and grab it again, but someone may beat him to it.
on this. I was super clear that if he found me a contract within certain parameters I would buy. I wasn’t browsing 
Especially VGC, spec renting galore going on over there.
