Cartman thank you very much for your response, even if it somehow stresses my mind with the clear fact that I got cheated. (Awww!) But thanks for letting me know the painful truth

I just checked some battery prices on the net and I will keep checking... probably he tricked me with @ 100$ on this one and as your price guide says with @ 90$ on the UV filters.
NewbieInCS let me explain my situation

I am new to the DSLR and to the whole photo world in fact

In fact I did check your price guide - for the cameras. I only had in mind to buy the original kit, with the 18-105 lenses - so that's what I mainly looked for. At the shop on the other hand, the guy told me about extra battery and UV filters which I had no idea about unfortunately, so I did not check any price guides. Thanks for your response
What do you guys recommend me to do? Check prices on the net for everything and if I find out that I was cheated big time on any item - get back to the shop? Will they be willing to re-negotiate? Or pay-back? And whats the actual cost of the camera with the lenses I've got - 2190 fair price?