Juan de Pareja (ca. 1608–1670)1650Free · sharp to 11.4 × 13.2 in at 300 dpi, uncropped
María Teresa (1638–1683), Infanta of Spain1651–54Free · sharp to 13.3 × 11.4 in at 300 dpi, uncropped
Philip IV (1605–1665), King of Spainprobably 1624Free · sharp to 6.7 × 12.9 in at 300 dpi, uncropped
Portrait of a Man, Possibly a Self-Portraitca. 1635Free · sharp to 10.3 × 12.9 in at 300 dpi, uncropped
The Supper at Emmaus1622–23Free · sharp to 11.8 × 11 in at 300 dpi, uncroppedReading the board
Each card shows the largest print the Met's file makes at 300 dpi without cropping — that's the sharpness you'd want for something you'll stand close to. The biggest file in this set isMaría Teresa (1638–1683), Infanta of Spain, at 4,000 × 3,412 pixels: enough for a 13.3 × 11.4 in print at 300 dpi, or 26.7 × 22.7 in at poster sharpness.
The Met flags one of these as a collection highlight: Juan de Pareja (ca. 1608–1670).
Every page has a size chart against standard frames, the museum record, and the frame and light that make a print look like it cost more than it did. The file itself is free. It always was.