There are 3 or 4 sponsors or regular posters here who do sell Dolmar chainsaws. Maybe not exactly "online", but a phone call and a credit card number will get you one. Guess where the 7900 in my shop (that has only been there for 2 weeks) came from? If you can find a local dealer who is conveniently located, has a clue, and seems capable of supporting the saw, that would be preferable; if you can not, these far-away dealers will sell you the saw.
Do a search on this site for "7900", read the threads, and look for the regular posters. It will become clear to you quickly.
By the way, great saw: Nice and light (barely heavier than my Stihl 026), yet extremely powerful. Fun to cut with.