Do not forget, you will lose about 12% of the total. About £60 on a &500 sale, eBay and PayPal fees.I’ve just had a look on Fleabay and the prices for a 128 gb unlocked iPhone 12 START at the £500 mark, which means I‘ll get significantly higher on there than the £519 Argos are offering!
I may go down this road now and keep the Argos deal as a back up seeing that its valid for 21 days!