I'm a Rebel player and we just started getting OP Kits for X-wing this year. Would anyone here know where to get those acrylic shield tokens from last year's kits?

There is the big trade thread here:

http://community.fantasyflightgames.com/index.php?/topic/105906-the-big-x-wing-trade-thread/

other than that it's probably the bay of e.