Many general EEPROM/Flash programmers support the J1A.
For low-volume, one can get by with using the M68ICS05JE kit from P&E. I still have an unused kit (bought as backup) for sale, if interested.
If you use the MC68HC705J1ACP (DIP package), and this is just for one piece I could send you one (for the cost of shipping), if you send me the S19 file, as I still have some left-over stock of MC68HC705J1ACP.