Hi Nick,
I guess it depends on how often you will need the programmer in the future.
I own the TL866 and also the T56.
As far as I know, the TL866 is out of production and the T48 is the follower.
The most of the TL866 you can buy by now, are counterfeit and maybe will not work properly with the software.
The T48/56 are not supported by the minipro software by now.
Are that serial EEPROMs or parallel?
For serial EEPROM (I2C or SPI) the programmers, you found at ebay, will do.
For parallel (like 2764 … 27512) you will need something like the xgecu programmers.
Greetings
Uli