I was going to ask why Skype and not with just a regular VOIP provider like mynetphone until I read the rest of your post..
You can probably beat that price if thats the model you're set on:
http://www.staticice.com.au/cgi-bin/....cgi?q=VOIP841
Or you could use the above search engine to look for other (ie cheaper) VOIP handsets..