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しか(shika, binding particle) is always used with a negative verb; as such, another interpretation could be "except for". It directly follows "the thing considered as the only choice", and always comes before the negative particle.
私しかこれを買わない
watashi shika kore o kawanai
Only I will buy this.
私はこれしか買わない
watashi wa kore shika kawanai
I will buy only this.
私はこれを買うしかない
watashi wa kore o kau shika nai
I have to buy this.
Etymology 2
For pronunciation and definitions of しか – see the following entries.