What tanning lotion can i find that is cheap and gives you a really dark tan?

I currently use Zero to sexy shimmer ultra bronzing and also have Sexy U bronzing. I'm wanting a really dark tan and this stuff just isn't working for me. Where can i find tanning lotion that doesn't cost too much but will give me a really dark tan? I'm thinking maybe from sally beauty supply or another tanning salon.... I really need some advice.. Thanks