The 30% off voucher at the top of this page is the lead One Kings Lane deal, and it is best if you want a straightforward sitewide cut on full price items. Use that voucher at checkout when your cart is mostly full price, because the code takes 30% off everything and the terms say it cannot be used with any other offers.
Small baskets, under $200. If most items are full price, use the 30% off voucher. For example, on a $120 order the 30% off voucher takes $36 off, leaving $84 at checkout. The 20% off code is weaker here; it only saves $24 on the same $120 order.
Mid size baskets, $200 to $700. The 30% off voucher usually wins for full price purchases because 30% off beats the 20% code and the 10% threshold codes. If you are buying marked sale items, the on site sales may offer larger reductions: sale discounts (for example clearance items up to 74% off or sale items up to 50% off) are applied automatically and do not require a code. Because the 30% voucher cannot be used with other offers, do not try to apply it to items already reduced by a separate sale.
High spend, $700 to $900. If your cart reaches $700 in full price items but contains no sale items, compare the 30% voucher with the extra 10% off orders over $700. The 30% voucher still gives a bigger reduction: on a $800 order the 30% voucher takes $240 off, leaving $560, while the extra 10% off over $700 saves $80, leaving $720. If some items are already on sale, the sale price plus automatic sale discounts may be more beneficial than any code.
Very large orders over $900. You have several choices. The 30% voucher takes 30% off full price items. The extra 10% off orders over $900 is smaller as a single percent but could combine with specific sale pricing if that offer applies to sale items, whereas the 30% voucher cannot be used with other offers. If items are on clearance marked down up to 74% off, that automatic sale price will often beat any code for that item.
Choose the option that gives the lower total. For full price purchases the 30% off voucher at the top of the page is the simplest way to save most; if items are already on sale, use the automatic sale pricing shown in your cart because the 30% voucher cannot be used in conjunction with other offers and so cannot be applied to sale items.