You are super close to Coble Ski School, which is one of the most respected schools in the industry. They may have some limited availability later in the season as they stay super busy. I am going to a one-day lesson on September 7th.
Next weekend is the NC State Championships at Coble, I would go check it out! http://ncwaters.ipower.com/StateEventorder.pdf
Also, there is a group of us who ski on Harris Lake near Holly Springs/Sanford at least once a week, send me a PM if you're interested in joining us sometime.