I don't think waiting is a good idea. Hindi naman yata nag sale yung previous two movies di ba It's unlikely that this will go on sale as well.
Episodes I and II went down to as low as P250 in previous sales. The Ep I and II pack went on sale for P650. Based on this trend, Ep III could be down to P250 next year, or even the 3-pack for P900?
Wait that long? If we were able to wait 20 years for the original SW trilogy boxset, no reason we couldn't delay buying this for a few more months, as we have probably watched this at least twice during the theater run last May.