Other vendors I have made note of that offer 100% VG (though not confirmed or tried by me) are:
Johnson Creek Red Oak Line
Copper Creek
The Vapor Room
Virgin Vapor
Liberty Flights
D&D Vapor
Velvet Vapor
Ikenvape
Rawr Vapor
Pink Spot (?, unsure)
I use VG due to a sensitivity as well ... the heaviness of an elephant sitting on my chest is just not for me when I vape PG ... down to even the flavorings. If I wanted that heaviness, I might as well stick with analogs. So I made the decision to switch to 100% VG and vape like crazy especially on the weekends and have no issues whatsoever.
These vendors are truly 100% VG, both in their base and flavorings. I have personally verified via e-mail or phone call and have also ordered from all of the vendors below.
Johnson Creek (Red Oak Line)
Virgin Vapor
Alien Visions (100% VG Flavors)
Velvet Vapor (PG Free)
Vape Dudes (Naturals)
VaporPhoxxe
HighBrow Vapor
Heathers Heavenly Vapes (Purity Line)
I've had pretty good luck with TH from most of the vendors I've ordered from, two of the newest who are quickly becoming favorites are HighBrow (customization on any order to include a TH enhancer - though I have never felt I had to try) and VaporPhoxxe (a little pricey, but well worth it in my opinion) Both of these vendors have wonderful customer service as well.
A huge trend I've noticed as well has been the all natural or all organic flavor. Seems many of the vendors who are doing 100% VG are taking a turn this way. I know Annette over at Virgin Vapor has been doing this since she's been making juice and is definitely on my top list of vendors (especially the Original Sin and Perfect Peach ... they are fantastic)
I wish I could vape PG just due to the consistency and make a carto last more than a couple days if I'm lucky. Some of the really thick VG liquid, (like Bobas Bounty or Gorilla Juice from Alien Visions) I can get a day from a carto ... but I buy cartos in bulk and that dollar a day for a carto is cheap comparatively speaking to analogs, not to mention the juice is just that good IMO ... so I just deal with it.
So, I think the sensitivity factor is why some of us make a big deal out of the VG to PG thing. It's not that we don't like or want to vape on anything PG, it's the fact that it causes issues in some form or fashion. VAPE ON!!!!