I've been buying my liquid splenda from American Health Foods:
https://www.ahfni.com/store/sucralose.php
As you can see, they call it sucralose instead of splenda, but it's the best dropper (glass!) bottle, and the best price on the market. Great folks to deal with, too.
My 4 oz bottle, for which I paid only $20, is finally (after nearly a year) running low, so I went to their site, only to discover that they're now selling the pure, unadulterated, ZERO CARB powdered sucralose. Yay!!!!
The 2 oz container is the equivalent of 70 pounds of sugar. Yep, *70* POUNDS. That's 140 cups of sugar! At $38, that's only .27 cents a cup -- FAR less per cup than anything else out there.
I'm going to keep using the bottle for liquid stuff, like coffee - but it will be nice to have the powerful powder for baking. I'm just going to have to figure out how to measure out an amount small enough. 1 gram = 1.13 POUNDS of sugar, so I figure a 'pinch' will probably equal a cup.
I don't have any affiliation with them -- just wanted to share the good news.
Lisa