The 3390 is widely available throughout the US and Canada. Some carriers that offer it in the US are Powertel, Cingular and VoiceStream.
Often resellers will offer great deals with the purchase of a contract for this phone. I have seen it for free after rebate, which makes it an unbeatable deal for the average user. On ebay, the phone is available for around $100.
The Nokia 3390 is a great beginners handset from Nokia, which sports stylish design and great SMS features.