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I camped Garnia for two days (she spawned about every 45-50 minutes) and got "Flo" on roughly my 12th attempt.
Garnia might be tough to solo as she hits for 200k repeatedly. So be prepared to use some fancy tactics to kill her if you're alone. Also, unlike a lot of the rares on Timeless Isle, she is hostile, so don't get too close if you're waiting for a group to form.
Best of luck! May the drops be with you :-}
Once you've beaten all the tamers (up to Aki the Chosen), you can only get Sack of Pet Supplies from the Pandaria tamers and from the Grand Master tamers on each continent, including Outland and Northrend.
As for the Pandaren Spirit Tmers, I've only gotten the spirit pets from the Pandaren Spirit Pet Suplies. I'm not sure if they have a chance to drop Porcupette as well. Same goes for the Darkmoon Pet Supplies -- I think that only drops the Darkmoon Eye but I'm not sure.
I managed to score mine in my first bag also, so I thought it would be fairly common. But word has spread around the server that I'm the only one with it. I know I was blessed by the rare drop gods and I plan to level mine asap. Oh, and I named it the first thing that came to mind that wasn't LoTR related...Mom :-}
Thundering Pandaren Spirit fight:
I used all rare quality pets for this fight. Rapana Whelk for the Thundering Pandaren Spirit as it has shortened CC times, a Dive, and a Shield. This helped with lower damage taken and high damage dealt. For Sludgy (critter) I used a Scorpid with Snap, Crouch, and Rampage. Then I used Spiny Terrapin for Darnak the Tunneler, mainly because I don't have a mechanical pet at 25, but also because he has nearly 2k hit points, a heal, and a potential stun.