I am finding the right word for a commodity that got potentiality, good functionality/technicality and also is in affordable price in relation to other similar product.
You can just use "affordable"
This stove is an affordable alternative to the fancy high end competitors on the market.
The fact that it is good enough functionally is implicit in the way the comparison is framed with the word "alternative".
This is an affordable stove.
also implies that it's functional, but does not stress that fact.