TheBouqs.com
I've had horrible experiences with pretty much all the flower sites until The Bouqs (featured on Shark Tank). The other sites fulfill via local florists, so you typically get tons of substitution, the arrangements look nothing like what you pay for, and there's all kinds of up-charges and fees.
They don't come delivered by some dingus in a van all pretty and arranged, but they score brownie points just the same. They're also shipped typically straight from the grower, so they're super fresh and generally last longer than even florist flowers. The price you see on the website is the price you pay, and the arrangement you're paying for is the one you get (i.e. no substitutions like the other sites).
Highly recommend. Sent a huge arrangement of some kind of flower I'd never heard of to my wife, being delivered today, for $35 out the door. They had a 25% off if you had them delivered today vs. V-day...Roses are a bit more than what I sent, but still, you can get a decent arrangement for well under $50.