Christmas has passed and retailers are focusing on after-Christmas sales in the next few days.

For a limited time, Samsung is offering up to $850 off when you trade in your Galaxy S20 Plus and Galaxy S20 Ultra smartphones. The discount is $300 instantly, and up to $550 more with a trade-in. After the discount, the S20 Plus drops to $349.99 and the S20 Ultra to $549.99. This is $100 less than this weekend's prices.

This is in contrast to the regular retail price of $1,199.99 and $1,399.99, which is a significant savings.

In our review of the Galaxy S20 Plus, we considered the S20 Plus one of Samsung's best new flagships; it doesn't feature the Galaxy S20 Ultra's 108MP camera lens, but it has a 6.7 inch large display, the 12MP lens impressed us, and the S20 Plus works on any 5G network, including Verizon's high-speed ultra-wideband communications.

That said, if you like the Samsung Galaxy S20 Ultra, the 6.9-inch S20 Ultra is one of the best high-end smartphones you can buy. It also has an unprecedented 108 MP main camera lens.

You never know when these deals will expire, so get them while you can.