Well 'Coast to Coast' (what this forum section is about) is a private membership program that you buy. 1st you have to buy into a home park with Coast to Coast affiliation and then pay yearly dues for home park & C2C.
Depending on which one.....Classic or Deluxe you can stay at C2C affiliate campgrounds for up to 7 days or up to 14 days for $10/15 night.
At other campgrounds...public etc. you can lower your sites costs by staying weekly, monthly or seasonal.
Passport America is another way of cutting costs......they are a discount program ($44/yr) that gives a 50% discount off of daily rate at participating CGs. BUT there are restrictions.......some only allow 1 night discount, some no weekends, some no prime time etc.