Grand Patio currently has the 15% off orders over $300 voucher at the top of this page, and that voucher is best when your cart is $300 or more and you want the largest percentage discount on a wide order. If you are buying sale items only or you hit one of the automatic fall sale thresholds, the sale deals can beat the voucher for specific purchases.
Under $100, If your cart is below $100, the only realistic savings come from the storewide percentage codes. Use a 5% code, since the $15 off requires a $100 minimum and the 10% and 12% threshold codes do not help. For example, on an $80 order 5% off gives $4 saving and a final price of $76.
$100 to $299.99, Use the $15 off orders over $100 code if it is greater than the percent alternatives. For a $150 order, the $15 off yields final $135 and a $15 saving, which is the same as 10% off on $150 (10% is $15). If you have an item on sale, check the 20% off sale items code for that item only, because 20% on a sale product beats the fixed $15 when the sale item value is over $75.
$300 to $499.99, The 15% off orders over $300 voucher applies and it usually beats the 12% off orders under $500 and the flat 10% codes. On a $450 order, 15% off is a $67.50 saving (final $382.50) versus 12% off which is a $54 saving (final $396). Use the 15% voucher at checkout because its percentage is larger. Note the 15% voucher cannot be used with any other offer.
$500 to $599.99, The 15% voucher still applies here and will generally beat the plain 10% storewide codes. The 12% under $500 code no longer applies because your order is $500 or more. If the items are marked sale and eligible, compare 20% off sale items for those sale SKUs, since 20% on a sale item gives the larger saving on that item.
$600 to $998.99, You can use the 15% voucher, but also the fall sale $70 off when you spend $600 applies automatically. Compare them for your total: for a $650 order, 15% off saves $97.50 (final $552.50) while $70 off leaves $580, so the 15% voucher is better for that basket amount. If most of your cart is sale items, the 20% sale code may beat both for those sale SKUs.
$999 and up, The fall sale $120 off $999 is an automatic checkout discount and the 15% voucher still applies to orders over $300. For a $1,200 order, 15% off reduces the price by $180 to $1,020, while the $120 off leaves $1,080; the 15% voucher is the better saving. Remember the 15% voucher cannot be used with other offers, while the $120 and $70 fall sale discounts are applied automatically and do not require a code.
When choosing, calculate the total each applicable offer gives and take whichever leaves the lower final price. Use the 20% sale code only on sale items since it applies to selected products, and note the 15% voucher explicitly cannot be combined with other offers.