Technological innovation and fierce market competition make both the time between and the demand during two successive product introductions random, while extant work in price protection assumes deterministic selling season. That is, under a random selling season, the manufacturer (she) is pro-early introduction, whereas the retailer (he) is pro-extended selling season. Any efficient trade-off should consider both a random selling season and a variable demand. Thus, a problem wherein she gives a target date for the introduction of the subsequent product to the retailer, and he places an order based on this date as his selling season, besides pertinent incentives for both early and tardy introduction, is considered here. Specifically, the performance of No left-over sale channel versus a Left-over sale one is compared when a quantity buy-back policy and rebate policy are used. Findings show both channels ensure coordination, yet only the latter channel can assure a win-win outcome.