Do you wear your old bras, or only nursing bras?

I have three nursing bras, but none of them have any support whatsoever and with the size of my chest it gets really uncomfortable.

I started wearing some of my old bras, but it's a pain to try to feed him... I deal since when I'm not nursing I'm more comfortable.

Did you pay high $$ for a supportive nursing bra (I have my eye on a few from cake lingerie!), or do you wear your old bras?