Buying wedding bands?!

Carlota • Everything that shines ain`t always going to be gold.
I'm now engaged and we're both new to this whole process. I was wondering who buys the wedding bands? The man alone or you both buy them for each other? That makes sense to me but I just want to make sure. The man already buys the engagement ring so i don't think it's fair for him to buy both wedding bands as it won't be special on his end to have something he bought.. Especially something special like a wedding band.