i am building a stand from my 240 acrylic and i would like to build it by notching the 4x4s like the pic below. problem is i cant find any straight and level 4x4s, they are all twisted and jacked up. does anyone know of any places that have a good supply of wood? i live an corona ca. also would i be able to accomplish the same effect by screwing 2x4s together?

