Sports Bras?

I have been hoping to start working out and losing weight... I'd like to start running a bit... However, I have had issues finding a good sports bra for a decent price... Will I end up having to spend $75ish... I usually just buy sports bras from Walmart... Im right at the top end of their sizing... They work fine for just general work or sitting around the house... But, for any kind of heavy activity they don't provide much support... I've seen the SheFit bras on facebook. I'm definitely interested in those but they're nearly $70... I don't really want to spend that much and then not like it. Has anybody tried those before? Any other brands you've tried and liked? I'm about a 40DD... Thanks!