What is a focus going to run me?
I just looked through stuff, and apparently I didn't post this info anywhere, so I'll update the campaign info. As part of your team being sponsored, anyone who wants to be licensed and given an arcane focus is granted temporary licensure for the purposes of the Games. If you win, it's made permanent; if not, the license expires after a year and you have to apply for one normally.
Are partially charged wands purchasable; if so, in what increments?
Yes, in increments of 10 charges.
That actually was one of the things I meant to ask before. A Wand of Righteous Aura at CL7 is 420gp a charge and I wondered how many I'd need. For instance, being tournament based no more than one charge per arena day would have been needed given the 7 hour duration right? 10 Charges should work...
Well... I would say that the assumption of an 8-hour adventuring day in something like this is a little naive. Sure, there will be some days like that, but there will be others where you're going for longer or shorter.
However, funds likely won't be too big an issue, so you can always buy a new one if you run out.