Not 100% sure I completely understand still, but I'll take a shot and see how close I can get for you : )
It seems that you are wanting to supply liquidators themselves, in essence establish yourself as a broker. If a liquidator who only sold kids toys then wanted to increase their range to include electrical, they could come to you and you would source that range of products for them to sell as well?
OK, well if that is correct, the problem you have is that liquidators buy their stock from the actual source, and they buy in massive volume so they can then afford to pass on the savings to their customers.
For example, a liquidator may well have a contract with Target to purchase their surplus stock. They deal with the source, it's the only way they operate.
Dealing with a broker to source their products would just increase their cost, that would need to get passed on to the customer and they would not be able to compete with other surplus suppliers.