These super-cheap Prime Day deals are under £50 and will pay for themselves

Amazon Smart Plug: £24.99 £12.99 at Amazon
Save £12 - A smart plug is a great way to lower your electricity bills, letting you schedule to turn appliances on and off automatically when you don't need them. Amazon's take on the idea also handily can be controlled with Alexa devices like the Echo Dot – and is currently half price.

TP-Link Tapo Smart Plug: £12.99 £7.97 at Amazon
Save £5 – This TP-Link smart plug manages to undercut the price of its Amazon rival, but still works with the likes of Amazon Alexa and Google Assistant for voice control. More importantly, it also lets you schedule and control home appliances remotely so you can turn them off from afar or according to a preset schedule.

Philips Hue White and Colour Ambiance (two pack): £94.99 £44.99 at Amazon
Save £50 - Replacing your old lightbulbs with power-efficient LED ones is a good way to keep your bills down, but even better is adding smart LED bulbs to your life. These dimmable Hue lights can be scheduled to turn on and off (not today, burglars) and can also be voice-controlled.

Nutribullet 600 Series Blender Starter Kit: £59.99 £47.99 at Amazon
Save £12 – If you find yourself regularly tempted by pricey smoothies or lunchtime sarnies, a Nutribullet could well be a wise investment. This popular model is 20% off right now, unusually taking it below £50. Its 600W motor will make light work of whole fruits and vegetables, while the 680ml cup is big enough for a generous meal. Our Editor in Chief has one and swears by it.

Morphy Richards Induction Frying Pan and Saucepan set: £69.99 £40.25 at Amazon
Save £29 – Whether you have an induction hob or not, this five-piece stainless steel set will taking your cooking efficiency up a notch thanks to their Thermocore bases for speedier cooking and less energy wasted. With three saucepans, a milk pan and a 24cm frying pan, it's an ideal set for all types of cooking and is dishwasher safe, too.

Wilko four-litre air fryer | £55.00 now £35.00 at Amazon
Save £20 - An air fryer is a fine way to crack an expensive takeaway habit and this model offers impressive value. The main reason for its low price is the lack of a digital screen, which you'll find on pricier rivals, but it still has a dual-capacity basket allowing you to fry two dishes separately. It also comes with a two-year guarantee. 

Philips Sonicare Protective Clean 4300: £139.99 £49.99 at Amazon
Save £90 - We can say from experience that expensive dentist bills can really mount up. A better idea is to invest up front in a powerful electric toothbrush and this Philips model offers excellent value. It promises to remove a lot more plaque than a standard brush and also lets you know when you're pressing too hard - plus it's cheaper than the Oral-B range that many will only think about when buying an electric toothbrush.

Lexar Professional 2000x SD card (32GB): £47.86 £29.99 at Amazon
Save £17.87 - Buying SD cards during sales events like Prime Day is a classic way to save money in the long-run,as you're going to need to buy them anyway. There are multiple discounts going right now, but if you have a mirrorless camera and regularly shoot photos and 4K video this Lexar card is our pick. It offers speedy 260MB/s write speeds and is rarely this cheap.

SanDisk Ultra 512GB SD card:  £70.00 £32.99 at Amazon
Save £37 - If you have a Nintendo Switch and need one card to back up your whole gaming library, this 512GB SanDisk card is a great buy at this price. It also comes with an SD card adapter and has never been this cheap.

Finish Powerball All-in-one (110 tablets): £26 £10.35 at Amazon
Save £15.65 - Bulk buys are a great way to make long-term savings during Prime Day. It isn't quite as glamorous as a shiny piece of tech, but getting 110 dishwasher tablets for just over a tenner will allow you to set aside more money for impulse tech buys.