If you are comfortable with your current ball driller, why bother getting a ball drilled out there? They may have stuff "on sale" but the majority of the time the sale stuff is either older balls or maybe international stuff and they aren't that cheap. Sure the guys at the booths can tell you what's working and what not, but if you're within distance to go get a ball drilled before you bowl you can simply go watch people bowl and get an idea of how to play the lanes or what type of equipment is working.
That's the thing...I'm in the market for a new driller. I live 3 1/2 hours from Reno and I am driving up there for a lesson with Mike Jasnau a month before I bowl. I figured the experts would be up there and could give me the best advice on how I should lay each piece out. If they could do Tri-grip I was willing to build an arsenal while I was there since most all my stuff is ancient. I'll try pinging Bill Hall to see if he knows if anyone that knows the Tri-grip will be up there.
Do better than that. Call the stadium, and get the numbers for each of the booths there. Tell them when you are going to be heading up there, and ask if they know about Tri-grip. If so, that will get you at least headed in the right direction, That way you have at least half of the answers you are looking for. Jasnau will help you get lined up and recommend what gear you need, and the booths there can get it punched up.
However, you may find yourself in a Catch-22; Jasnau can recommend what gear you should get in your coaching session, and you get the gear.. but you've blown your coaching session, especially with getting lined up with the gear on the patterns there.. But you can't get the new gear punched up until you know what you want, so you can have the coaching with the new gear.
Either way, definitely call, because you probably have something in mind that you are looking at, but aren't sure.
BL.