What you are looking for is in:

TIER 1
1) PTP (advice: give up, very hard)
2) HD-Bits (advice: give up, very hard)
3) TehConnection (advice: give up, hard)
4) Pirate the Net (advice: give up, very hard)

TIER 2
5) HD-Torrents (advice: try a giveaway or make a request on VIP Forums)
6) Awesome HD (advice: try a giveaway or make a request on VIP Forums)
7) Beyond-HD (advice: try a giveaway or make a request on VIP Forums)

TIER 3
8) IP Torrents (get a free giveway on the VIP Forum)
9) Demonoid (register a free account)

TIER 4
10) If everything else fails, go to a public tracker

I see a lot of internal private tracker releases leaking to IPTorrents. The internal group from BeyondHD, FraMeSToR, releases remuxes and high quality 1080p encodes. Their releases also get posted on IPT. Also other internal releases from HDBits etc get to IPT eventually.
IPT has bad rep but the content and speeds are great + it's not that hard to join.