just searched fins for some fins and saw loads of longboard fins for sale. just thought you might be looking - looked quite cheap.

just a word of warning though - i just received some spare fins i bought from ebay. 2 m5 glassflex fins, sides L&R, because i have a spare centre fin. thought it would make me up a spare set cheap. twat has sent me two centre fins . have just sent him a mail, but kinda loosing the faith with ebay after someone else tried to rip me off on my last transaction.