The name of the game at NuMe right now is the 20% off ReNu21 Nano Repair Leave In Mask voucher at the top of this page, best if you are buying that selected mask. That code takes 20% off the ReNu21 mask only (selected products only, website only), so use the 20% voucher when that item is in your cart. If you are not buying that mask, other sitewide codes and automatic deals are likely to save you more depending on basket size.
Very small purchases under $24 If you are buying an accessory priced from $24 or small add ons around that level, the 10% off storewide code is simple and applies to everything, but 10% of $24 is only $2.40. Use the 10% off storewide code for single low value items unless you have a 15% code valid for your order, in which case the 15% code is better.
Single item around $89 (pearl curling wand) The Pearl Curling Wand for $89 is a marked deal that cannot be combined with other offers. If you want that wand specifically, the $89 price is the best route because the wand deal excludes other offers, so buy it at $89 rather than trying a percentage code that might be invalid.
Orders $99 and above Orders over $99 get a free heat protectant automatically at checkout. That free gift is added without a code, so if your cart hits $99, the free product often beats a small percentage saving in value. For example, if the free heat protectant would retail near $15, reach $99 to get it automatically while still applying any valid code that the site allows.
General sitewide discount choice You have three percentage codes: the 20% mask code for a selected product, an extra 15% off your next order code, and two 10% codes. For multi item carts where the mask is not included, use the 15% code rather than either 10% code because 15% always gives the larger saving on the same items. The 10% storewide code carries an explicit term that it cannot be combined with other promotions.
Buying from best sellers or curling tools under $199 Those limited time price deals already place items below $199. Because those promotions say they cannot be used with other offers, take the reduced price on the product page when it is lower than the price after a percentage code.
When choosing, work out the total each way and take whichever leaves the lower final price. If an offer says it cannot be combined, do not expect stacking; use the single best eligible promotion for your cart.