How do I get invites to torrents sites?

Like many people, I’ve been hit hard by the decline of oink.cd. But we soldier, preferably to another, similar site. Do any of you flutherers know how one goes about getting invites to say, waffle.fm, what.cd, or libble.com? I have invites to give to indietorrents.com, but I have no idea where or how to trade.