Amazon does not allow one to create a permanent link to a specific seller. You can only link to the ASIN, which will determines the seller to display on-demand.

Amazon does not allow one to create a permanent link to a specific seller. You can only link to the ASIN, which will determines the seller to display on-demand. Unless the product category or brand is "gated" (and to be fair, many are), meaning it requires pre-approval to list on Amazon, anyone can hitch onto any ASIN by telling Amazon they have that product in stock (if FBA, by sending in "that product").