This is for one 24-pin 8KiB EPROM, with free programming of a provided image if you desire.
These are desirable chips, because they are pin-compatible (no adapter needed) with the old Mostek MK36000 mask ROMs, and the 2364 type ROMs used in IBM 5150, Commodore 64, VIC-20, 1541, Sinclair ZX80/81.
Typical use would be replacing the BIOS chip in an IBM 5150, or adding a diagnostic ROM for such machine to your toolkit.
If you are purchasing for a 5150, you should get the third revision BIOS (10/27/82). Unlike the older ones, this supports 544K RAM, and Option ROMs (needed for EGA, VGA, Hard Drives, XT-IDE). The older BIOSes are there for novelty and collection purposes.
Larger quantity price breaks are at quantities of 5, 10, and 20.
If you'd like a different kind of EPROM, there is another product page with all the others I stock.