A great resource that my buddies and I rely on frequently is this:
http://the.honoluluadvertiser.com/current/sp/golfguide (for all islands)
Includes all rates as of Summer 2009, including twilight rates.
As for renting, why not just buy a cheap set and then donate? Sports Authority on Ward and Costco usually have good deals. I'd second
rockdoc's advice on calling the stores to see if they rent or if they have leads.