I am part of an active group of Unity3D developers that has already published two titles in the App Store. While your budget is way on the low end for a realistic golf game, a more lighthearted title could be created in a month with our offer. Two playable characters, nine holes, weather effects, and classic course elements (bunkers, water, rough, fairway and green). Golf mechanics would be, however, simplified (as in Wii Sports).