True seed only refers to the black seeds formed from the flowers of the plant. If you sow true seed, the plant that grows would be called true seed progeny. I planted some bulbs of true seed progeny.
Garlicana farm in Oregon is currently selling true seed progeny that you can plant as bulbs! You have to physically mail them payment, though, no credit card or Venmo or bitcoin yet
https://www.garlicana.com/garlic-varieties/true-seed-progeny/
You can also get your garlic where I did, from Gateway Garlic Farms, and pay with Venmo, but his inventory of TGS-related garlic is much lower. His website is not accurate and you can only reach him through Facebook and Facebook Messenger.
These are the two TGS sources I know of in North America, but Iโm sure there are more; check out forums like Permies!
You can grow clones of true seed progeny by planting their bulbs for years and years if you wish! But ultimately my goal is to assist in the effort of increasing genetic diversity in the garlic crop by breeding TGS-producing garlic varieties and planting their seeds, hopefully producing varieties that easily set much seed, and also have delicious bulbs.