The swap is this huge user run board where people sell and trade vidoes. I have had a lot of luck finding cheap workouts, the people are great. You have to have a lot of faith but it is really fun.
It can be hard to get on to the site though. You have to first be approved to get a free ezboard account which takes a day or two. There is a lot of disscussion about it here
http://forum.videofitness.com/showthread.php?t=43807
on the video fitness site.
I don't know why everybody says Turbo Jam won't be in stores. Charlene says on her blog that it is going to be on QVC this month.