I also agree that it was the seller's responsibility to disclose his terms BEFORE the deal. Whacking someone with additional hidden charges after the fact is not an honorable negotiating tactic and holding the item hostage smacks of scumbaggery. You would be within your rights to demand he ship the item as defined in the ad, and if he doesn't like it, then it'll be a valuable lesson learned on his part to be more diligent when posting an ad.
Seller asked for PayPal fees after the sale. Should I pay them or not?
I recently purchased an item and after accepting my offer the seller asked for PayPal fees (3%). I checked the listing and nothing was listed in the ad about my paying the fees. I have already payed half the fee but I'm not sure if I should have paid the full amount. Changing the deal after accepting the offer feels wrong to me. Looking for guidance.