If the breeder was selling babies from his/hers breeders would the money from them not be enough profit. Or would he/she risk a sale for $12 Like others have said here some people will just back out of a sale if there are extra cost put in even if it is like a $12 extra fee.
Unless you really dont care if you herps sell fast or not then i guess you could charge what ever extra fee price you want.
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