Martin Lewis has warned Asda and Sainsbury's shoppers need to be aware of delivery price increases in the run-up to Christmas.
In his latest MoneySavingExpert.com email, he explained how the two supermarkets have changed their rules for delivery - meaning that the price of slots will now change.
While the new pricing structure will mean that some shoppers actually pay less than before, others will pay more.
Here's everything Asda and Sainsbury's shoppers need to know, according to the Express.
What has changed?
The cost of a delivery from Asda will change depending on the day, time and store.
Sainsbury's has also updated the prices of delivery slots, with certain times of day becoming more expensive.
Martin explained the changes could hit vulnerable customers the worst and many could be left out of pocket.
Martin stated: "At Asda, vulnerable shoppers will now have to start paying for slots.
"Sainsbury's has completely rejigged its pricing structure – its cheapest one-hour delivery slot has quadrupled to £2."
Earlier this year, Asda introduced free slots for vulnerable customers.
This has now been increased to £3 for orders under £40.
Regular Asda slots could now cost up to £7, depending on the time of day.
At Sainsbury's, orders over £40 will cost between £2 and £4.50, previously costing between 50p and £7.
While this will work out cheaper for some, others will be left paying more.
How to avoid extra charges
The expert explained there are some ways to avoid paying more.
Booking deliveries for quieter times of the day will drive down the delivery cost.
Regular customers can also look into delivery passes.
The cheapest times are usually in the early afternoon or late on a weeknight.
These are fixed fee subscriptions offered by supermarkets that allow multiple delivery each month.
Those who can shop in store, or order using click and collect, are encouraged to do so.
Supermarkets have continued to update their shopping rules during the coronavirus pandemic.
This is to help keep in line with government guidance.
