FWIW I got an email from Aero about a sale they are running through the 5th.

SAVE 15% OFF SITEWIDE
During our Independence Day Sale you can SAVE 15% off our entire website. You will also receive FREE SHIPPING on all orders through July 5th.

*Exclusions include July 4th sale category, Join or Die products, July Builder Sets and other select products.

The above is from the email with exceptions and conditions.

FYI I have no connection with Aero whatsoever only as a customer as I ordered my AR carry handle from them after I cancelled one I ordered from another supplier.