RE: wall charger
I don't think you can, you might want to try Toys'r us or tower hobbies, I thought I saw just the charger at toys are us. Now if you want a quick charger like 15 minute charger you can plug into your car or the wall we have those but there any where from $30 to $130. You might want to check Tower you might be able to get the 4 hour plug by itself.