I visited Pismo Beach a couple weekends ago and found a really great wedding venue for a pretty reasonable price.
The Best Western Shelter Cove Lodge is located on the northern end of Pismo Beach, away from the center of town and all the tourist activity. It's also a part of Pismo Beach where you get cliffs and a more craggy ocean view - which makes for some pretty spectacular wedding photos.
Shelter Cove Lodge has two venues they rent for weddings, both with awesome views:
The Wedding Garden offers a wedding ceremonial arch, as well as seating for up to 80 guests. You can rent this venue for a two-hour wedding ceremony for $700.
The Panoramic Gazebo offers stunning ocean views, as well as standing room for up to 25 guests. you can rent this venue for a one-hour ceremony for $250. (You will have to arrange for your officiant)
You can get more particulars by emailing them at firstname.lastname@example.org.
Pismo Beach is really a lovely location for a wedding, not only because of the ocean views, but also because it's super close to several different wine country areas: San Luis Obispo; Arroyo Grande and, a little further drive north, Paso Robles. Be sure if you have your wedding there to pick up some bubbly from Laetitia Winery, just south on the 101 from Pismo Beach. And, definitely have dinner at Rosa's, which is just a couple miles south of the hotel.
I snapped this shot of the two different wedding venues. The wedding garden with the arch is on the left, and you can see the gazebo on your right.