Well you say you'd like to get a years supply of hormones to grow your own breasts huh? Well let me tell you. I was on hormones for a year and a half, than for reason I don't want to get into, I got cut off for three months and completely lost all of my breast growth. So you're plan is flawed, sorry to inform you.
Now almost a year back on hormones, my breast are close to what they were before I got cut off. And I do love my breasts. But if they are hit, they really hurt, hurt almost as badly as having your balls hurt.
Also for the first few months, doorways aren't your friend. I can't even count how many times I've accidentally hit my boobs with the door while opening it.

If you truly want breast with out having to transition to a woman yourself, you can consider implants, though finding a doctor to do the surgery would prove difficult.