If you are willing to invest in an airbrush compressor, I highly recommend Ocean tanning solution, which I buy on Amazon.
My mom got me an airbrush and the tanning solution for my birthday last year, and I have to say that the spray tans I've done on myself/had my boyfriend help me with have been better than any MysticTan or other self tanning product I've tried - and believe me, I have tried them all. The Ocean solution has instant color in it so you can see where you spray and that washes off in the shower. The DHA in the solution will cause color to develop in 6-8 hours. I would recommend spraying the night before or day before so you shower once before getting in uniform, as the instant color rubs off on clothes , sheets, etc. (but has washed out of everything I've gotten it on!).
A less expensive option: Tomas Tan from Sally Beauty Supply. It is by far my favorite self tanning lotion. Great natural color, not an awful smell like some of them, and the bottle comes with gloves so your palms don't turn orange - bonus!
One final recommendation for all the pale girls out there like me: try Moist Hemp Bronzing Moisturizer, also at Sally, in between spray tans or self tanner applications. It's basically a more cost-effective version of Jergens Natural Glow - the bottle is bigger, I think it smells good, and it does the same thing as Jergens, leaving just a little hint of color.