"If you originally purchased a Special Offers device, you will be charged a one-time payment to unsubscribe from this service, covering the difference between the device price with and without special offers. "
The process, linked above, is not an option if you're outside the US. If not in the US, you'll need to contact Customer Service to have the SOs removed and be assessed the applicable charge:
'Help > Need More Help > Contact Us' link at the bottom of this forum...or any amazon.com page.
NOTE: I do NOT speak for or represent Amazon in any fashion. This is a customer to customer forum.
Disclaimer: I have examined any sites I provide links for and have determined them to be safe but I make no promises about safety, content, ads served or anything that might make you clutch your pearls in horror. Use discretion clicking on links provided by total strangers such as myself.