Stumbled across Rose City Textiles seemingly new website, fabricline.com On the site they are selling black X-Pac fabric seconds for $9 a linear yard, as well as firsts quality X-Pac for $13 or so. I called them and asked what style X-Pac it was, the seconds is definitely VX21, I didn't want to make her go back and check the firsts rolls. I am in no way affiliated with RCT, however I did just make a purchase for some of the said fabric. Just want to pass on the deal I found.

Had trouble finding it; use this link: https://www.fabricline.com/searchResults.php?a=1&keywordSearch=polyant

Better prices than Rockywoods. VX-21? in black, charcoal grey, and (everyone's favorite) kiwi green. Seconds are for black only.

If you click on the details for each fabric it states that the charcoal and kiwi are VX07. Thanks for the link, good prices.