I would guess this has to do with the "restricted items" status that the SmallFly holds. Spyderco got hit hard because of their bali's (read up on it, I don't want to drag that up again) and is taking necessary precautions.
If you can't buy the knife straight from Spyderco, I would guess they're not going to sell you parts either. I would contact the dealer that you bought these from and see if they can help. As a dealer, I would imagine they have access to these parts from Spyderco and should work to take care of you.
If you want to get pissed at anyone, make it the folks in the 10th Circuit court that improperly ruled on Spyderco's bali's.
42 Spyderco fixed blades and counting...