Bed Bath & Beyond has filed for bankruptcy protection – so you might be wondering how long those 20% off coupons you've been holding onto will last.This week is your last chance.Bed Bath & Beyond said it expects to process returns and exchanges in accordance with its usual policies until May 24 for items purchased prior to Sunday. It also anticipates gift cards, gift certificates and loyalty certificates will be accepted through May 8.It will stop accepting coupons on Wednesday.Founded in 1971, Bed Bath & Beyond had for years enjoyed its status as a big box retailer that offered a vast selection of sheets, towels and gadgets unmatched by department store rivals.It was among the first to introduce shoppers to many of today's household items like the air fryer or single-serve coffee maker, and its 15% to 20% coupons were ubiquitous.But for the last decade or so, Bed Bath & Beyond struggled with weak sales, largely because of its messy assortments and lagging online strategy that made it hard to compete with the likes of Target and Walmart, both of which have spruced up their home departments with higher quality sheets and beddings. Meanwhile, online players like Wayfair have lured customers with affordable and trendy furniture and home décor.In late 2019, Bed Bath & Beyond tapped Target executive Mark Tritton to take the helm and turn around sales. Tritton quickly reduced coupons and started to introduce store label brands at the expense of national labels, a strategy that proved disastrous for the retailer.