Aldi shoppers go wild as chain slashes price of big packs of popular tea to just 6p

There are plenty of comparison websites out there that'll check prices for you – so don't be left paying more than you have to.

Most of them work by comparing the prices across hundreds of retailers.

Here are some that we recommend:

• Google Shopping is a tool that lets users search for and compare prices for products across the web. Simply type in keywords, or a product number, to bring up search results.

• Price Spy logs the history of how much something costs from over 3,000 different retailers, including Argos, Amazon, eBay and the supermarkets. Once you select an individual product you can quickly compare which stores have the best price and which have it in stock.

• Idealois another website that lets you compare prices between retailers. All shoppers need to do is search for the item they need and the website will rank themfrom the cheapest to the most expensive one.

• CamelCamelCamel only works on goods being sold on Amazon. To use it, type in the URL of the product you want to check the price of.

Consumer reporter Sam Walker reveals how you can save hundreds of pounds a year:

Odd boxes – plenty of retailers offer slightly misshapen fruit and veg or surplus food at a discounted price.

Lidl sells five kilos of fruit and veg for just £1.50 through its Waste Not scheme while Aldi shoppers can get Too Good to Go bags which contain £10 worth of all kinds of products for £3.30.

Sainsbury's also sells £2 “Taste Me, Don't Waste Me” fruit and veg boxes to help shoppers reduced food waste and save cash.

Food waste apps – food waste apps work by helping shops, cafes, restaurants and other businesses shift stock that is due to go out of date and passing it on to members of the public.

Some of the most notable ones include Too Good to Go and Olio.

Too Good to Go's app is free to sign up to and is used by millions of people across the UK, letting users buy food at a discount.

Olio works similarly, except users can collect both food and other household items for free from neighbours and businesses.

Yellow sticker bargains – yellow sticker bargains, sometimes orange and red in certain supermarkets, are a great way of getting food on the cheap.

But what time to head out to get the best deals varies depending on the retailer. You can see the best times for each supermarket here.

Super cheap bargains – sign up to bargain hunter Facebook groups like Extreme Couponing and Bargains UK where shoppers regularly post hauls they've found on the cheap, including food finds.

“Downshift” – you will almost always save money going for a supermarket's own-brand economy lines rather than premium brands.

The move to lower-tier ranges, also known as “downshifting” and hailed by consumer expert Martin Lewis, could save you hundreds of pounds a year on your food shop.