The Hagglers cart reads the product page for you — just click Add.
Add the item yourself: enter its SKU# (required), square feet, and a description.
On any of these, open the floating Hagglers cart (bottom-left) and add items. Items without a listed price show Pending price — a haggler comes back with a price, and where there’s already a price, you’ll see the deal (crossed out with the % off).