Just thought I would throw out this FYI- I was pricing casters for my new brutus system and came across this site. Super prices and quick shipping. They can wholesale their products as they make them in house.
I also used McMaster for the caster inserts (cost more then the freakin caster themselves!) but anyway what a cool company. I live in WI and since they are in ILL, I ordered Monday and have them already today! Wow