Can I buy TMs in Pokemon Go?

Excuse me, I've been hearing a lot about this Pokemon Go game and I'm quite intrigued. I've noticed that there are some virtual items, like TMs, that players can use in the game. My question is, is it possible for me to purchase these TMs directly within the game or do I have to earn them through gameplay? If purchasing is an option, could you please guide me on how to do so? I'm really interested in enhancing my gaming experience and I'm willing to spend some money to achieve that. Thank you for your time and assistance.