 More on these stories at townhall.com. It's the biggest July 4th sale ever at Big Sandy Superstore. And it's going on all weekend long. Start with up to 20% off furniture and then take an extra 10 to 15% off eligible items. Save up to $1,200 on mattresses and then get up to $300 in extra exclusive rebates on top mattress brands. Finance it all for up to five years. Interest free.