I see you don't have Animated Jazz either...

One thing to consider is whether you want the other Dinobots to go with him. I'm missing Swoop (and need to fix one of Sludge's robot legs, and replacement parts/weapons etc etc) and the G1 Dinos are pretty costly these days. If you do want to get the whole set (& let's face it, like most of us you probably will if you don't already) you're better off with Animated Grimlock and co. on a cost/accessibility basis.

That said, if you're patient, willing to save for a while (hard while 13 I realise), and suitably ingratiating I'm sure someone from here would be happy to split postage with you somewhere down the track for MP Grimmy even if he doesn't get an AU release, a lot of people here seem to be after him and we all get what we can when we can. You've got a whole lifetime to get one, it's not like you have to stop collecting TFs once you 'grow up'...heh.
I've got a treasured beat-up G1 Grimlock from my childhood and the MP is pretty costly so I'm gonna pass, but he does look pretty sweet IMO.