I ordered my kitchen fronts from such a place, to fit on … an IKEA kitchen. Giving it a different look, but the benefits of standardised units and the IKEA universe. This was customised mass-production, but still about 3x IKEA price point.
That's not the case in the US.
The big box hardware stores have a large track saw vertically mounted that can cut full sheets of wood, but there usually isn't someone working who is trained to operate it. They also have a rickety cart with a hand saw and tape measure attached with too short cables that you can try to use to make your cuts of dimensional lumber.