Hi,there is not all you can eat Kobe beef restaurant,but there is valuable cost Kobe beef restaurant,it is called Takimi En NIKUICHI ,there is very popular places at GiNZA area ,You can check it by google,Ginza Toy shop HAKUHINKAN,that restaurant is 5 floors there .it is about 50 US dollars by dinner.
I believe the best place to eat it in Kobe.
But I know one restaurant in Tokyo.
This restaurant offers Kobe beef in shabushabu and sukiyaki.
The price for lunch is reasonable about 1000 yen to 2000 yen.
Even the dinner price is btw 5000 yen to 6000 yen.
Here is the web site.