nothing too expensive, but i like to play some songs with tremolo and was wondering of a good tremolo pedal
Well, depends what not too expensive counts as ...

But my vote would go to one of the following:

- Carl Martin Surf Trem
- EHX Pulsar
- Catalinbread Semaphore Tremolo

The CM is the most basic, EHX has like one more option and the Catalinbread is everything I think you could ever want in a tremolo, modern or vintage.