shop-bought 
adjective
(Especially of an item of food) bought in a shop as opposed to being home-made: shop-bought pasta sauces...
- Out came coffee and tea, and shop-bought mince pies with the tin foil still attached.
- It is possible to cheat, too, since shop-bought custard is so much better than it used to be.
- While most people fly shop-bought plastic kites, many still elect to build their own.