It was fun while it lasted. BGR exclusively reported back in May that Sprint was doing away with mail-in rebates for an unspecified period of time. According to a purported leaked document obtained by Sprint news site SprintFeed, the limited-time promotion will come to an end later this month. “Duuude, where’s my rebate?” the dealer memo asks. The answer — riddled with errors, though it may be — is July 24th. As we’ve learned long ago, typos and grammar mistakes hardly mean a carrier-made document is fake, and Sprint customers who prefer to buy their devices directly from the carrier should consider doing so before the 24th. A Sprint spokeswoman declined to comment. Hit the break to take a look at the purported letter to Sprint dealers.