Someone used to sell the add-on packs. But that was years ago.
Then again, I bought the packs from him, and after a year, they strangely disappeared from my account, lol. I don't know what you play, but as someone who likes playing with effects, I actually didn't miss those packs that much. Even at $200, I do think you have better options than POD Farm. I'm a little disappointed that Line 6 hasn't refreshed POD Farm. It's already been years since they released the HD models and M effects, both of which I think are superior to anything POD Farm offers.