Amazon has the 2L Windex Glass Cleaner Spray Refill (Original) for $6.98 - $0.99 off coupon (check "Save an extra" box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel at any time) = $5.64 with free shipping on $35+ or with Prime. Refill equal to nearly three 23oz trigger bottles.