There is a reason that they are that much, probably the 440lbs drawer capacity. However you might look at Northern Tool. They have some 5" poly wheels for like 15 a pop that are decent. I would not by a caster at HD of HF that I needed to support more then a 100lbs for any length of time. If your box sits its one thing, but if your box gets pushed around all the time then good casters are worth every cent.