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911chips maybe $200-$300. Other ones not sure since 911chips is probably the most well known. It helps if you have the specs for each chip such as the intended octane, with or without immobilizer, etc
It's my understanding only the 1995 models (US) can use a chip.
Only 1995 cars have a user changeable chip. 55pin DME
1996 cars have a none flashable chip. Those are the unpopularest version. 88pin DME
1997 and up have a flashable chip. But only experts with the right equipment can do this. 88pin DME
Hopefully you all here realize that not every manu wrote each chip. There were only a handful worldwide that tested/coded each. These chips were sourced from a small outfit and not produced by each..