A question of licencing

So, I’m reaching the point where I’m gonna have to buy the licence, and I have a couple of questions. First off, and I’m 99.999% sure about this, I just need the GCode one for my TwoTrees TTS machine, right?
Second, does it matter where in the world I buy it from? The reason I ask is that I’m in the Philippines, and apparently it costs P3500, which is $62.51 as I type this. If I use a different browser, it comes up as $60. I assume this is due to conversion costs, but the money is in $US in my Paypal account, so can I just buy it for $60?