The main offer at Project E Beauty right now is the 10% off voucher at the top of this page, a sitewide code that takes 10% off everything when you enter it at checkout. That code is best for straightforward purchases where you want a guaranteed percentage off normal priced items across the site. There are also other codes for 10% and 5% off, plus a sale with up to 61% off certain items.
Small orders under CA$50, Use the 10% off voucher at the top of this page. On a CA$50 order, for example, the 10% code takes CA$5 off, leaving CA$45, so you save CA$5. If you are considering the 5% codes, they state they cannot be combined with other promotions and only save CA$2.50 on a CA$50 order, so the 10% code gives the lower total.
Medium orders CA$50 to CA$200, The top page 10% code still wins for most non sale purchases. On a CA$120 order, the 10% voucher takes CA$12 off, leaving CA$108, so you save CA$12. The alternate 10% storewide code matches this saving but the page code should be used first. The 5% offers would take CA$6 from CA$120, leaving CA$114, and their terms say they cannot be combined with other promotions, so they are strictly worse than 10% for the same items.
Large orders over CA$200, For regular priced items the 10% sitewide code remains a straight 10% saving; use the voucher at the top of this page. If many of the items you want are in the sale section, compare the sale price to the price after the 10% code. The sale is up to 61% off selected products. For example on a CA$120 sale item at 61% off, the sale price becomes CA$46.80, a saving of CA$73.20, which is far bigger than a 10% code on the unsale price. If the sale price already applies to the items you want, buying from the sale will usually save more than any code.
Buying sale items, Use the sale price when the item is marked down. The sale says up to 61% off sale products; that percentage applies where shown on individual items. The 5% offers cannot be combined with other promotions, so they will not improve a marked down sale price when terms exclude stacking.
Other situations, The 60 day money back guarantee is not a discount. It gives extra return protection while you shop but does not change the price. If you see two different 10% codes, use the voucher at the top of this page first as the page lead.
When choosing between the codes and the sale, pick whichever leaves the lower total for the same items. If an item is already in the sale, the sale price will often be lower than applying a sitewide code. The only explicit combination rule shown is that the 5% offers cannot be combined with other promotions, so treat them as single use only.