I have that gold star delta Mew from EX Dragon Frontiers. One that's PSA Grade 10 is worth around Ł160 (about $230US/$320AUS). I got it out of a random pack and it's probably one of the best cards I ever pulled. Unfortunately, Mew-obsessed 10 year old Beth decided to carry it round everywhere so it's in terrible condition and probably worth about Ł1 if I'm lucky :|