I am having trouble tracking down a single 2018 arrow to foot my new carbons.

Is there a store/vendor where you've had luck finding a single arrow of a somewhat unusual size?

Thanks.

If it were a 2016 i could help you out.  You might try posting over in the classified section & see if you have any luck.    
Someone just might have a bent one they want to get rid of!

I have one or two that I can donate to the cause. Shoot me a PM with your contact info and we will make it happen  

Thanks, rastaman and pickaspot.

Pickaspot, PM sent.