Stephanie mentions that workstations are not meant to be switched every week. Repetition in workstations can help solidify mastery.
Materials are important but don't get hung up on the made for Math products. Upcycle as much as you can to make materials for your workstation.
Focus on items that can be used for more than one workstation.
Organization is key. Tubs, bins, and boxes- Coffee cans, fishing tackle boxes, and Ikea bins work great. Take a look around you and be surprised how many containers can be cleaned and reused for math manipulatives.