Trackers you can get invites from
AL: Unlimited invites available in the What.cd Power User forums.
FTM: Unlimited invites available in the What.cd Power User forums.
FTM: Available in the Waffles Power User forums.
HDBits: Available in the Waffles Power User forums.
iFi: Unlimited invites available in the What.cd Power User forums.
iTS: Unlimited invites available in the Waffles Power User forums.
Music Vids: Unlimited invites available in the What.cd Power User forums. Strict rules for Power Users, Elite and above just have to ask.
Ptn: Unlimited invites available in the What.cd Power User forums. Must answer a questionnaire and they are pretty selective about who they invite.
SCC: Unlimited invites available in the What.cd Power User forums.
ScL: 50 Invites available at Pornbits.org forums. Need to be the top user class there (Hustler: 250GB Upload, 1.5 Ratio, 4 Weeks) or have been a member for 20 Weeks and have a ratio above 7.
ScL: Unlimited invites available in the Power User forum at BitMe, but if you're only a user you can still pm him directly and you may be able to get one, userid is "76753"
ScL: Unlimited invites available in the What.cd Power User forums.
SDBits: HDbits.org has one invite per user for SDbits, link can be found in few different forum sections I found it in "Recycle Bin" section.
SDBits: Available in the Waffles Power User forums.
TiT: Unlimited invites available in the What.cd Power User forums.
TiT: Available in the Waffles Power User forums.
Waffles: Unlimited invites available in the ScT forums.
What.cd: Unlimited invites available in the SCC forums.
x264: Unlimited invites available in the What.cd Power User forums.
demonoid:it have invite forum
cinemageddon:it also have invite and request forum for powerusers
x264:it also have old invite forum
bitgamer:it have invite and request thread where invites are given and recieved for power users and above only
btw : Access to some Tracker attached at the top very tough, but these methods to smooth it only
