What version of the Delica do you have?Steel and handle scale type. If it's a recent version you should be able to get clips from Spyderco for $5 each.
Oh dear, you've got an early gen-3 Delica with a barrel-screw clip. I'd try contact Spyderco first, they might, and I mean *might* have some spare clips laying around, but I think you might be out of luck. That particular model's been discontinued for... 6 years at least.