Where should one go about finding some stock injectors for an FD?

I have been trying for months to get some injectors from injectorwarehouse.com and jcwhitney and both of them keep telling me they don't have any in stock with my only option being to keep trying every 4-6 weeks. I can't send in the cores or else they could just rebuild those.

 

I know you can get them from Mazda but the price may be a little high. The issue is that they are side feed injectors, where were only used for a short while and the FD is the only car that used such high CC side feed injectors.