GROUP BY Min Price BUT Return Primary Key Of Row

I have a table with multiple products from different suppliers. there will duplicate products in my db as Supplier A may stock the same product as Supplier B. I have a business rule that only one unique product can be online at one time and as such I want the cheapest product from the 2 Suppliers to be displayed where there is a match.

I have been trying a Group By clause and also a partition by but my problem is returning the primary key for the winning row (minimum price).

here is an example

CREATE TABLE #TempTable(
productcode nvarchar(50),
productname varchar(50),
productmanufacturer varchar(50),
saleprice money,
tyrewidth varchar(5),

[Code] ....

How can I return the productcode in the above query for the row with the cheapest price? If I try MIN(productcode) or MAX(productcode) it will not always return the product code associated to the min price.