With Prime subscriptions on the rise, Amazon is constantly exploring ways to cut the cost of regular home deliveries. One option the retail giant is considering is to invest in the companies that deliver its parcels, with UK courier firm Yodel currently the object of its desire. The Guardian reports that the two companies have agreed a deal that could see Amazon acquire 4.2 percent of the UK's least popular parcel delivery service for £8.7 million. While Yodel is now the second biggest service of its kind behind recently-privatized Royal Mail, customers haven't been so supportive, putting the company at the bottom of the delivery polls for the second year running. Amazon continues to use a variety of delivery firms across the world, but the company has recently begun using its own trucks to deliver parcels in the US. It's not clear whether Amazon could amass a bigger fleet on the other side of the Atlantic, but strategic investments such as this suggest it could be a possibility.