Hi there, welcome to the forum!! Most seem to buy their ballscrews (I presume you're meaning ballscrews and not Trapezoidal lead screw?) from Fred at BST Automation over on Aliexpress. He has good prices and packs your ballscrews and linear rails well apparently (I've not ordered from him but others on the forum have said good things about his stuff and packing!) The requirements for a laser and a router are slightly different, if you make the machine suitable for a laser then it'll not be suitable for a router, lasers need speed and routers need stiffness (and speed.)