Everybody is always looking for t52 and no9 pigs, but they're increasingly rare. So your only option there is to watch the secondary market, and I can guarantee you'll pay quite a bit of markup. I've paid anywhere from $20-40 for them. They're good, but not that good.
Honestly, I think that while I loved both, a nearly equivalent experience can be had in the standard Robusto for half the price. Unless you've got a finely honed palate, there's not a huge difference. Your basically paying for rarity and age. The blend on the no 9 is a touch different, but not $20 better, and the t52 blend is the exact same iirc.
FFPs are a different animal, and I wouldn't pay over $15. Not because theyre not good -they are delicious and i LOVE - them- but because they pop up a number of times a year, and aren't too hard to find. I'd recommend that you get to know your B&M owner. Otherwise givers gain. Help others find rare, limited, or htf stuff and you can build a network of guys who will help you out in return!