Do you have any old hard drives? I'm sure I do as I almost never actually throw them away unless they have mechanical problems.

I recommend something like this: StarTech.com USB 3.0 to 2.5" SATA III Hard Drive Adapter Cable w/ UASP - SATA to USB 3.0 Converter for SSD / HDD Item # 861670 from Office Depot. The price listed on their web site is $19.99

With the adapter you can easily connect any SATA drive to your computer. Once the drive is mounted and formated you can use it like any external drive. When you don't need it, just disconnect and put it away.