According to Flyer hardware and software developer Brandon over at Retroswitch:
The next run of Flyers are about to enter production and I’ve begun hand building limited batches in the meantime as I start working through the waiting list. I really want to thank everyone for their patience as I obviously underestimated demand.
I estimate the production batch of Flyers should arrive by the end of this month. There is no need to reserve at this point as there should be plenty available.
Source: Flyer product page
This is great news since there are still a lot of Commodore computer enthusiasts looking to purchase a Flyer modem.
Be sure to keep an eye out on the Retroswitch Blog for updates on availability.