Quote - I often see logos attached to specific items     one is an 'R'    the other is a  $-sign

The "R" means Renderosity Exclusive, i.e. only sold here.

The "$" means the item is on sale.

The "C" means the item is in clearance and has been discounted by an additional fixed amount. Any of these item that don't make sales in the 60 days after being moved to the clearance section are removed from the market place.