Questions & Answers about Цена не столь высокая.
Столь means so, that, or to such a degree. In this sentence, не столь высокая means not so high / not that high.
It is close to:
- не такая высокая
- не настолько высокая
So Цена не столь высокая is a fairly compact way to say The price is not that high.
In Russian, the verb to be is usually omitted in the present tense.
So:
- Цена высокая. = The price is high.
- Цена не столь высокая. = The price is not that high.
Russian does not normally say Цена есть высокая here. That would sound unnatural.
In the past or future, you would use forms of быть:
- Цена была высокой. = The price was high.
- Цена будет высокой. = The price will be high.