SuperNaturals via Amazon offers the Bell Girls' Hello Kitty Protective Gear for $6.52. Order via Subscribe & Save to drop it to $6.19 and bag free shipping. That's the lowest price we could find by a buck. It includes padded gloves and knee and elbow pads with high-impact skid guards.
Note: Be sure to cancel your subscription after receiving your item to avoid being billed for subsequent shipments.