I've never seen the TFC00 break $300, yet alone shatter the barrier.
seems like anything with a movie name sake has exploded in pricing.
With the TF Encore G1 reissues coming (Convoy, Megatron, Starscream, Soundwave), it might be a good time to list that 00 Prime. I'd have to say that the market will peak by mid June.
If the movie is awesome, expect a TF high to last for another 2 weeks from June 4th. If the movie blows, expect the TF high to occur in Mid-June. (during the hype season)