This kit allows you to get it all in one purchase. This will ensure you will be ready when the time comes to change out the sponge-head for a new one.
Package includes:
Dirt eRacer system
Replacement sponge-head
16oz soap squeeze bottle for storing ready-to-use soap
Hook for hanging the Dirt eRacer 
 
UPS Ground shipping for U.S. is $9 for one kit. Combined shipping amounts apply at checkout when purchasing multiple items.