Hi David. I can help you with this one as I have a Skyscout that I purchased from Scope City in Las Vegas when on holiday.. The simple answer is yes it is the same unit all over the world and has all the same info in it. I love my unit and have used it alongside of a Dobsonian to find objects and to identify them. I made a mount to put it on the telescope, but it nedds to be mounted with distance due to magnetic problems... The comment that blue Skys has made about more northern objescts is a little true, but Their has been heaps of updates and lots of deep sky stuff and more southern objects.. I have not had a problem yet of not being able to find what I am looking for in the menu of objects (I live in Adelaide). I would see things in Magazines and then go and find them with the skyscout and look at them with my telescope..
Anyway Yes you can purchase then far less overseas. If you are purchasing a new one just be aware that the warrenty will not be covered here. My first on I got did not work and Celestron would not cover it here in Australia. I had all sorts of problems getting it replaced. It was a good thing that Celestron were the sponsors of the International year of Astronomy. A few E-Mails to the organisers expressing my concers over Celestrons warrenty policy soon got some attention from celestron (Funny that!). They agreed to replace the item and I am very happy with it.
you will also still be able to get all the online updates as they become avaliable. Great to show freinds and children and is really good with a speaker attached so you can here all the audio on the objects you are looking at. You can just use a cheap Ipod or MPS external speaker rather that using the overpriced Celestron Speaker..
With all that said, Yes it will work and if the price is good, I would grab it with both hands. You will have alot of fun with it..
Cheers