Surfing Waves

Hey guys. So I got my first board while ago, it's an 8'0 superfish xl. Love it, I catch tons of waves. It has 5 fin boxes i ride it as a quad. It came with the fins.anyways, my question is, how much are decent 5 fin sets? Mine came with fcs fins, not sure which kind most likely shitty ones they're just plain white. But the shops around here sell crazy 5 fin sets like carbon fiber and stuff...I don't think I need that. But I want the 5 fins et so I can change it out between quad thruster and twin. Btw the new board I'm getting is from a friend, another's fish board, 6'4" 5 fin box

You could just go on FCS's website http://www.surffcs.com/
and check prices. The carbon fiber fins and the fiberglass fins can get expensive.