I'm about to order some Mr Vape samples. 5x 6ml for $10. So 60ml for $20. Not the cheapest, but you get to try 10 different flavors and they have a good rep here. (But it's impossible to search for Mr Vape as the "Mr" is too short a search term and teh term vape comes up, oh, a little often.)
I've done BlueMist. They have samples too. I devoured my Hypermist. Don't recall what else I liked. I did like that they didn't require steeping.
If you order ECBlend, prepare to steep. I'm vaping some Peach Watermelon Cantelope today that just now matured after 9 days of steeping with the cap off. ECBlend also has a fun "Create your Own" but be warned, you can make some horrible crap with it. I swear my Havana Gold/Virginia/Tomato/Malted Milk seemed like a good idea at the time. But it ruined my life forever. Milky tomato vomit flavored tobacco. The horror, the horror.
MadVapes is cheapish too. Pick up some Grandpa, it's really complex and weird. Their licorice is some strong stuff. I have an order for the two coming in now. 30ml for $8, but I'm still trying stuff out so I don't get more than 10ml ($4.29). They have a sliding scale based on the nic content. Those are quoted for 24mg.