Mobile phone prices can vary dramatically from country to country. Because you didn't say which country you will be buying it from, it is hard to give you an accurate price.
However, having had a search on eBay (the "go-to website" for these kind of purchases) I gathered you won't have to spend much, as it is not a recent model anymore and there seem to be may people trying to sell their old CE0168 handsets.
Depending on how well conserved or damaged the phone might be, with more or less scratches or cracks, fully functioning or just for parts, you will be certainly able to get your hands on one without spending much more than £10, according to the link below:
I hope this helped!