@slayer
There always has to be one trouble maker. So phrased as a question, partly because I am not sure of the facts and partly to make it less offensive.
Surely the cheapest way to the whole collection immediately, always has been, and still is, to buy the booster packs? 10 for $9.95, saves 50 cents on a 100. :-)
I know they rebuild, just not sure how quickly.
So if you get all the blonds, brunettes first then bikini, stockings and big boobs would most likely include most of the few you missed. Sure there are going to be a few that don't fit any pack, there are going to be a few left at the end (the packs are not available if you only have 9 remaining in that catagory).
The DUOs are a bit more expensive, or less cards.
Good luck working that one out precisely. Maybe 550 for $547.25 plus $100 for the last 50?
You might need several credit cards. 55 $9.95 transactions is going to set alarm bells ringing!