Saradomin armour sets are made by exchanging all the components of a set of Saradomin armour with a Grand Exchange clerk. Players can then exchange the set with a Grand Exchange clerk to receive the set pieces as individual items. The set is purely to save space.
The Saradomin armour set is considered to be a symbol of wealth among Free-to-Play players, as it is simply a trimmed variant of rune armour, and provides the exact same bonuses as a Rune armour set (lg) or a Rune armour set (sk), though many players believe it looks much better. It is the first most expensive free-to-play item set that is not discontinued.
Saradomin Armour sets were reduced to 20gp in boxed form, but were later changed back to the price of all the pieces, This was due to people scamming where they would sell saradomin but then swap the saradomin for rune.
You can now buy the boxed saradomin set for the price of the set but this is only from another player. You can no longer buy a boxed god set on the grand exchange.