If you've been shopping on Amazon for a while you've probably happened upon plenty of listings for items that offer 'Subscribe & Save' options - lowering the price of an item by committing to place future orders periodically. It can be a great way to keep stocked on essentials at lower prices than their regular RRPs. These subscription plans are particularly alluring when they're available on slightly more luxury products - where the savings can be even more attractive.

That's just the case with Olaplex's No.7 Bonding Oil , which gives you a better deal if you subscribe, taking it down to just £18.09 for a 30ml bottle instead of £20.

10 - and those savings will definitely add up over time That means you can schedule a regular delivery of this super-useful and powerful hair oil (named the best lightweight hair oil by The Independent ), to help you maintain healthy hair without having to wait to pick up a new bottle after you run out. It's ideal for boosting the shine in your hair and helping to reduce breakage by potentially really big margins. READ MORE: Amazon's 'bestselling' hair dryer with 9,000 five-star ratings shoppers use to replace Dyson slashed to £15 READ MORE: Guess backpack wearers say is 'perfect size' much cheaper if you ditch brand site To get a sense of how popular the oil is, you just have to glance at Amazon's review section, where more than 48,000 customers have left ratings behind, averaging out at 4.

5 stars. Many of these are really positive raves, too,.