Don't know if anyone else here loves Sugarmegs as much as me, but they stream hundreds of concerts for free and allow downloading after 6pm. No login required.
Anyways, the website is: link
The Queen stuff they have is:
1974-12-06 Cologne
1975-05-01 Tokyo
Queen Demos (State of Shock Bootleg)
Actually... hundreds of shows was an understatement, they claim over 20,000 on their website.
I love poking through old shows (like Elvis in Vegas) and checking them out.