Has anyone used a private transportation source from airport to resorts and on excursions
Do a search for private transfers and you will find lots of info.
I've used Dominican Plus and Dominican Airport Transfers. Both are reasonably priced and reliable. Check out their websites for pricing.
You could also check out PuntaCanaMikes private transfer prices on his website.
We used transfers.do and could not have been happier! Seem to have the best "pay in advance," price, too.