Awesome deal on a fantastic machine! I had the 400 model for 16 years and loved it! When it finally stopped working, I decided to replace rather than repair. I do miss it though. It wasn't the least bit tempermental, worked great no matter what brand of thread. I'm sure you'll be happy with it!
You can get the bobbins on eBay or online for less than the Viking store inside of Joann's.