We do not have plans for another Group Buy in the near future for the ARC-8 design. Last year we hosted a round in February, and then again in Sept/August. As of right now we are on the same schedule.
But... we have a new design coming out. It will be announced in 3~ weeks, and will be available via a Group Buy pre-order. There will be an over lap in sizes, so that would be your best option for discounted pricing.