The ATF's Rule 41F takes effect July 13, 2016 - which still leaves you some time to get those purchases made and the stamps on the way in for processing. Applications that are approved or in processing prior to this date will be honored, so now is the time to get the applications in if you've got a trust with more than a couple people (or people who aren't that close to each other).
EuroOptic is offering discounts to help with this on Suppressed Armament Systems, SilencerCo, and Operator's Suppressor Systems products. Take a look through and see if there's something on your list that you haven't checked off yet.