Online stores are a good place to look if you don't need the assistance of a sales associate.
Most tennis shoe soles are non-marking, but confirm with the sales associate before making your purchase.
Otherwise, the next time you're in your local TV retailer, ask the sales associate.
You can always change these specifications later, but it is good to have a list so that a sales associate at a store will not be able to pressure you into buying something you really do not need.
Receiving a generous product sample is as easy as requesting one from a sales associate.