When I was on BI with the ex in 2004, we got a coupon sheet from Hilo Hattie that had some discounts for some golf courses on it. Not sure if they still give those out though-I think we got it when we bought our stuff at the cash register. I'm pretty sure there was one for the Waikoloa courses (we played the Beach course and loved it). With the discount, I think it was just over $100, but was well worth it, as there are quite a few holes that you look over the ocean.
If you are staying at Paniolo Greens, ask if they have any affiliations with the golf course they are on. We stayed there, but didn't play that course.
Also, buy "The Big Island Revealed" blue guide book, they would have extensive tips on the golf courses and prices.
Are you taking your clubs or renting? I've done both, and speaking as a golfer from the East Coast, it's well worth the rental fee at the golf course to not have to lug those clubs around. I rented a set of Pings that I eventually bought at 1/2 retail price on E-bay. It was great to have tried them out and known I would love them before buying them!