Here is the response from Spraygunner
“I think the whole country is waiting on a shipment of these needles! We can't find any available right now and do not have an ETA for these to arrive. Manufacturing out of Japan has been off most of this year. Please subscribe to notifications and you will get an email saying when they arrive back in stock.
Kind Regards
Dan
Spraygunner Team”
I also heard back from Sharpenair with some tips that helped.