Reddit reviews Workbench Caster Kit 4 Pack

I got them from Rockler, they work great.

Something like this probably. Maybe not this exact one but I don't have time to search.

https://www.amazon.com/Workbench-Caster-Kit-4-Pack/dp/B005W0UWCY

Rockler workbench caster kit - http://www.amazon.com/gp/aw/d/B005W0UWCY

You can never have enough clamps.

Mobile base - http://www.aconcordcarpenter.com/2012/04/portamate-universal-tool-base-pm1000-review.html

http://www.amazon.com/Rockler-Workbench-Caster-Kit-Pack/dp/B005W0UWCY/ref=sr_1_1?ie=UTF8&qid=1426171533&sr=8-1&keywords=Rockler+Workbench+Casters

It's a bit pricey, but there's also something like http://www.amazon.com/Rockler-Workbench-Caster-Kit-Pack/dp/B005W0UWCY - casters that flip up when you're not using them so that the table rests fully on the ground