There are many external USB CD/DVD optical drives, and some will invariably come up for sale on Black Friday, Cyber Monday or around certain holidays. Ditto for standalone Blu-Ray and DVD players (we are not providing links for those).

For those who have requested links to possible inexpensive drives for consideration, here are three (our department makes no claims on their usability, but their specs suggest they will work as expected; the first drive link listed below has been confirmed to work with the new Dell 3520s):