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I tried a LOT of different types of lube, and my absolute favorite is still Slippery Stuff Gel (not the regular liquid.) It doesn't contain glycerin, so it never gets sticky (or promote yeast infections), and it's pretty affordable for a high-quality lube -- you can find 32oz quantities on Amazon for around $25-ish. I've been using it for dilating for a year and a half, and it's also awesome for sex, too!
Yeah, most lube was not actually designed with vaginal health in mind. I went through a period where I tried lots of different brands, including "medical" stuff like Surgi-lube, and most of them are kinda terrible. Most of the most well-known ones, like KY, ID and Astroglide just flat out suck. I really liked Sliquid, but I need lube every time and it's expensive, so I stick with Slippery Stuff (just as good to me, although I've only ever used the Gel form and can't speak to "regular" Slippery Stuff liquid.) Slippery Stuff Gel is also what my pelvic physical therapist used in her practice.
I usually order the 2-pack of 16oz pump bottles from Amazon, but they sell a big 32oz bottle too (and smaller sizes, obviously.)