Looking for a tips about EEC-IV and EEC-V Hardware

I would like to test few things on my fiesta '98. The ECU is EEC type with J3 connector.

I found that info: http://static.moates.net/quarterhorse/qh_intro_meyer.doc

But I think that module from Moates (QuarterHorse) is expensive. I would like to ask, is there any other way to read/modify that kind of ECUs cheaper?

Thanks in advance

Julian