There is one on E-bay for sale for $560 - so if they will take $300, you got a bargain. Here is a link to the owners handbook, just in case it doesn't come with one:
http://www.husqvarnaviking.com/us/Hu...andbook_x_.PDF
The advice above is important - if you don't thread it properly, it won't work. Get a good pair of pointy tweezers to help pull the threads through some of the tight spots. That is what I do on my serger. A trick they taught me at my LQS is to NEVER unthread it. If you want to change thread color, clip the old thread up by the cone and tie the new thread on to the end and "serge" it until it goes all the way through the needle. Hope I explained that so you understand. My serger isn't a Husqvarna but the principle is the same.