I thought
this wouldn't fulfill your 'low profile' requirement until I saw the Origin 8 Vivid Pro you've ordered. Anyway, it doesn't cost anywhere near $50 and it puts out way more that 250-300 lumens, so perhaps you wouldn't have liked it anyway.
Don't care for the looks. I should've mentioned I wanted 250-300 real lumens, not ebay lumens. My Super Drive XL at 500 lumens is just overkill for a daytime flasher. Plus the mount on it is getting kind of noisy with 10k miles on it so that was the other reason I wanted to get a summer light.
Anyways I got the light next day from Pricepoint being in CA. It does sit higher than I'd like but I don't think you're going to get much smaller than this for 200+ real lumens. I'll probably run it under the bar next to the stem for a more stealthy appearance. Probably won't start using it for another month or so when the daylight doesn't run out towards the end of my ride.