You may have better luck making contact with smaller hardware chains and mom&pop stores.

it’s pretty easy stuff
you need a product they need
you need to have all your costs known
(the resourcing, all the parts, the manufacture, the packaging, the shipping) you need an inventory and you need a commercial address.

Once you have it in the package it will be merchandised in, shown on the shelves (bin boxed, standing, hanging on a post, in a clamshell, whatever) Then you make an appointment to meet the buyer who buys for the department your product will be shown in. You show up on time you walk in thank them for their time and tell them how soon you can ship how many and for what price they say yeah or nay.

is that easy or what