it appears that Skype is not available for your device yet;
Hiya. I was looking for skype for my Nokia C3 as well and this is what I've found:
You can download it to your pc and then send it to your phone via bluetooth or you can download it directly to your phone.
It its - as far as I know - the only version available, but please do keep in mind that it is a BETA. You can use it for IM but you can't make skype calls with it.
Had no problems with it so far.Hope it works for you as well.