Use Google's blogsearch function as mentioned here before: go to Google's homepage and click More and then: Search in Blogs or something like that (I have the Dutch version so I'm not sure what's it called in your country).
Typ the bands name like this if it consist of more than one word: "Golden Earring" so Google will only search for the combination of those two words and not each word seperatly.
search over the internet the bands you want some bootlegs from and you will probably able to join some groups using Direct Connect or Soulseek or even newer P2P protocols.
Fuck me mate, there's fookin hundreds of the bastards. Use any one of the above links and scroll right down to the bottom of the page. There's links there to all sorts.
__________________ Rapidshare files will automatically expire if they have not been downloaded within a 90 day period, so if you find some links are dead, you have unfortunately been too late in discovering them.