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White Castle has this coupon valid for a free slider with any purchase, good through October 31, 2015.
Good for your choice of a free slider (not valid on Waffle or Double Slider).
Also at White Castle get up to $25 off an online order with White Castle promo codes good through November 7, 2015.
Get $5 off a $25 order with promo code SAVE5. Or get $15 off $50 with code SAVE15 or $25 off $75 with code SAVE25.