What about the folding legs behind the folding sofa bed?
Actually, it's cheaper to buy online. If there is no price advantage, everyone will go to the store to buy.
This phenomenon only change with the legs to the market to buy joint movable sofa legs but the general public is very difficult to buy this product only professional sofa manufacturers know to buy the product in which sofa accessories building materials market. You can weld your sofa leg with a handle to increase the force area and enhance the stability. Hope for reference!
With the hinge is convenient, easier to carry out, generally, if a good product is not unstable phenomenon, you may buy a poor quality products.