I've been in VIctoria's Secret and Aerie with my girlfriend and there are bins of underwear for like 1.99 for one and all kinds of deals.
Most Helpful Girl
I've spend a lot more then 50$ on one bra. This ish is expensive though I know what you mean, I go broke just walking into Victoria secret/ La senza. if you don't like the price don't be so picky about brands.