So which posters have you tried to buy and failed to get? I've actually been really lucky so far.
My first miss was Kill Bill. I had just started collecting Mondo prints and wasn't able to get before it sold out.
I've also missed out on:
Tron by Ansin
Dracula Variant-got the regular but really wanted this one.
Jurrassic Park-luckily I was able to make a trade for it.
Black Widow by Olly Moss.