Huh, looks like they might be. I found where I've bought them in my order history, and the page now says they're Unavailable. I imagine they aren't being produced anymore, so supply had to dry up eventually. I also think they may have only been offered by one 3rd party seller, since all the ones I got were from the same seller (Lotsa Electronics). I sent them a message asking what's up.
A sealed retail box copy is your next best bet. Less bang-for-your-buck most of the time, but sometimes you'll snag a preorder bonus, like the TR-116A.
The 60 day time cards can be found on Amazon for <= single month sub
Gets you 1K zen, lifts EC cap. I'd go that route, if you're interested in dropping some money on the game. You can also use an original game code (again, Amazon and the like) for cheap to get the boff.
Oh wow. I was just looking at that. Does anyone else do this? It seems cheaper then do an active account as that is about 12-15$ / month and this is 7.50
-edit-
related, what do you get for buying the game?