If you are lazy like me and want to collect all the various Collectible Minifigs from Series 1-5 and don't want to buy extras to get them all, this eBAY listing might be of interest: http://www.ebay.com/itm/270802535875?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649 About $4.25 per minifig(US) and shipping included. Not bad for the ability to get all 80 minifigs at one time.

I just bought sealed Series 3 and 4 for a similar price if you broke it down. Series 1 is going for around $100-$105(sealed) Series 2 is going for $65(sealed) Series 3(below) http://www.ebay.com/itm/LEGO-8803-Series-3-Complete-Set-16-UNOPENED-Sealed-Identified-New-/270885836376?pt=LH_DefaultDomain_0&hash=item3f120dd658#ht_500wt_1156 Series 4(below) http://www.ebay.com/itm/LEGO-8804-Series-4-Complete-Set-16-UNOPENED-Sealed-Identified-New-/270885832006?pt=LH_DefaultDomain_0&hash=item3f120dc546#ht_500wt_1291 Series 5 is going for $55-$60 I rather have sealed and marked than opened.