Send a self-addressed stamped envelope (SASE) to:
Rainbow Symphony, Inc.,
6860 Canby Ave. Suite 120 •
Reseda · CA · 91335
Request a pair of free Red/Cyan anaglyph 3-D glasses (in writing Of course) and they'll send them to you.
I sent for them and they arrived within 3 days. This offer is only good in the US...