Sea Bright, NJ is a relatively small beach community with nine private beach clubs, several municipal beaches (some mostly only accessible to locals because of lack of parking, numerous restaurants as well as bars, marinas and shops. Its beaches are the farthest North on the Atlantic Ocean in New Jersey, so it is the quickest destination for people coming down from New York or northern Jersey.
Prices vary based on location, lot size and style of home. Obviously a 5,000 square foot 5 bedroom 5 bath home on Ocean Avenue with dead-on views of the ocean and/or river and private beach access will cost you a lot more than a 1920s bungalow with no parking.
A few residential streets (mostly in the business district) are prone to tidal flooding off the river, so if you aren't familiar with the area make sure you get a LOCAL real estate agent who knows Sea Bright well and will level with you about problem properties. (No I'm NOT an agent, but I do own a property there). Houses on flood-prone streets sell at a discount, for obvious reasons. I would strongly caution against buying a flood property.
The town is great, the locals friendly, the streets are safe and you are convenient biking distance to Sandy Hook, Pier Village in Long Branch and any number of other destinations. If you like boating, you're just a few minutes to open ocean from the local marinas. For people coming in from New York, high speed ferry service is available to Highlands, just about 4 miles away. Train and bus service is also nearby.
From my experience there, many of the single family homes are inhabited year-round. A few homes are available for vacation rentals. Condos seem to be split pretty evenly between owners and renters.
I hope this information helps. Good luck with your search!