Thanks all for the suggestions, very useful! I created an add here in Fotosidan: Sigma 300mm F2.8 APO HSM EX (Nikon)

Since my swedish knowledge is a bit limited... I didn't know I could share the add in the forum. Thanks! :)

Hi, I am selling my Sigma 300mm F2.8D APO HSM for Nikon, but I am fairly new in Sweden so I am not aware where can this be done... specially because we're talking about a very specific lens that might only be interesting for professional photographers or people into wildlife or sports...