Sears offers the Agio International Arcadia 3-Piece Seating Set, model no. S9878-153511-2626, for $359.99. Coupon code "SEARS35OFF300" cuts it to $324.99. With free shipping, that's $375 off list and the lowest total price we could find. It features two chairs with all-weather cushions and an umbrella-anchoring side table (umbrella not included).
Note: It's not guaranteed for delivery by Christmas.
Also of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts.