Help! I was about to buy [[http://www.amazon.co.uk/Jillian-Michaels-Day-Shred-DVD/dp/B002RNOS2Y/ref=sr_1_1?ie=UTF8&qid=1332254260&sr=8-1 The 30 Day Shred DVD]] when I noticed [[http://www.amazon.co.uk/Jillian-Michaels-The-Collection-DVD/dp/B005ZCAZIK/ref=sr_1_3?ie=UTF8&qid=1332254260&sr=8-3 This collection of DVDs]] I am confused because the collection (including the 30 day Shred) is a cheaper than the actual Shred DVD - is there something I haven't spotted?!