Bobbin central no longer sells retail. You must have a wholesale account with reseller tax ID and the initial minimum order is now up to $100 subsequent orders are $50 (which is actually pretty easy for me to do
). There are loads of retailers that now carry Glide. Metro Embroidery
https://metroemb.com/store/index.php?route=common/home in addition to their own trilobal polyester, also carries Glide.