Looks like now the cheapest is a bit over that.

If you keep an eye out for cheap drives they come along on Amazon often:

https://www.amazon.com/Zheino-240gb-Internal-Notebook-Desktop/dp/B07DK6YDS5/ref=sr_1_1?s=pc&ie=UTF8&qid=1539316356&sr=1-1&keywords=240gb+ssd&refinements=p_n_feature_three_browse-bin%3A14027458011

https://www.amazon.com/ORICO-USB3-0-External-Enclosure-Supported/dp/B01M08LCXW/ref=sr_1_11?ie=UTF8&qid=1539316471&sr=8-11&keywords=usb+3.0+hard+drive+enclosure+2.5