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You can negotiate your fee structure with your client. bidorbuy has no say in this.
Fees that you charge may vary depending on the item that you are sourcing. The fees that you charge could be a percentage of the closing price, or it could also be a flat rate. However, please note that you are ultimately responsible for all bidorbuy fees, such as the transaction fee, Special Listings, etc. and you should therefore build such costs into your fee.