the common prices for the records are:
Breakthu (Shapped version) 20 pounds
Headlong (Clear with picture of the guy with mo' from "Innuendo") 18 pounds
The Invisible Man (See-through) 7"= 10p, 12"= 15p
I'm Going Slightly Mad (Shapped version) 20p
prices also see here, please: http://homepage.ntlworld.com/kennethdrury/queenuk-pg.htm
The Bootlegs: If you ask me, I wouldn´t pay anything for them. They are not that special. By the way their information isn´t true, because:
We Will Rock You- Volume 1 (Live-Europe '74) is Hammersmith '75 at X-mas
Volume 2 (Live-World Tour '85 [Part 1])
Volume 3 (Live-World Tour '85 [Part 2])
Both contain the show in Tokyo on May 11th 1985. You also find this show on the DVD called "We Are The Champions" or "Japan 85" and so on.
Bohemian Rhapsody (Live-America '81 [Volume 1])
is a mix of everything
Queen Live (Not sure of dates or country [Volume 1])
is Wembley 1986,incomplete. So you better should spent your money for the official releases of this concert.
I hope that helps you