I looked at one of the manuals for your monitor, and it appears to be a common standard cord used by most monitors that do their own internal power conversion, looking like this:

As they are standard, you may buy any brand and in various lengths, such as from this Amazon listing.

Be sure to buy a cord that has approval from a safety authority, such as Underwriters' Laboratories (UL) or Underwriters' Laboratories of Canada (ULC). A very cheap cord may lack such a designation and may not be safe.