The gift shop at Buckingham palace has a nice selection...
deleted user 04.12.2006 18:42
: P
Being ever-so-serious... I got my lovely generic Queen II cover-shot poster (because they didn't have the yellow jacket magic tour one !) from a poster store at the local college campus.
There are also on-line poster stores if you don't mind buying on-line.
Also, some used-music-stores sell posters. The one near me doesn't always have the same stock, but they get some neat things in.