Licence for Cubase 7.5

Hi
I like to know is it possible to buy licence for trial version of Cubase 7.5.
Thanks a lot

No, not officially.
You need to buy a Cubase 9 license, with that you can also run C7.5

How much is a price for Cubase 9 license?

That depends on where you are located, but can be seen in the Steinberg shop on www.steinberg.net for example