Generally speaking, for a one time seller or new seller for any property under $500K, you are going to pay 10% non-negotiable. Keep in mind the seller pays the commission, not the buyer. If you are on your 2nd, 3rd or more with an agent and you are showing continued business with someone, you can expect to get 8% with the big guys and may be 7% with others.
Yes, it's a rip off compared to other places, but that's just another expensive thing in the DR.
My electricity bill for a 4 bedrooms all with a/c, pool and everything else runs about $280/month USD.