Got my start from my grandmothers garden...I’ve given a few people pieces to start...But if you got a garden supply or farm supply store, they often have them to purchase. Where are you located?
Halfway between DC and Richmond. The ones at the garden center really didn’t look good, and then I was in Walmart and right there in the vegetables section (don’t look Ethel!) was a pile of great big horseradish roots for $3 each which is a great price. But are they treated like potatoes to keep them from growing?