I just took a vacation there last week before the summer rates kicked in and got a 4 bedroom 2.5 bath pvt pool and jacuzzi fully stocked for $525 in Avon for 7 days. That same rental goes for 1795 in mid august. You might also want try craigslist as well
I was very amazed how Hatteras Island and north side of Ocracoke is undistrubed with commercial development.
What I like most about Hatteras Island is the beach towns on the island have their own village type of feel with mom and pop type shops , restaurants, and cute looking store fronts. The only chain store I saw was Food Lion.
I know August is still a prime summer month but you might find a condo within your budget. Prices do tend to be lower on hatteras island because people tend to stay in the northern end due to box store amenities and more entertainment options and less of a drive. But if you are going to just enjoy the beach I recommend Hatteras or Ocracoke islands.
There is some real estate agents that do offer nightly rentals on the houses and I saw that some of the campgrounds do have cabins and was beachfront another option to consider. I also saw some mom and pop motels
One thing I thought was a plus is for me it was mostly a smooth ride out there they have majorly improve Hwy 64 alot of it is even 70mph speed limit
here is a photo of one of beaches near pea island
Here a photo of avon
This beach was near Rodnathe
There a trail near the end of Hwy 12 in corolla that I stumple upon by accident (I only knew of the currituck lighthouse and of course wild horses but didnt know of maritime forest and this beautiful estuarine it really took my breath away
i thought kitty hawk nags head and the towns up north of those cities was cute but too develop for waht I was looking for.