the birthing set is going to be worth the most...I think $25 for the complete set is fair
the white laying down cat (no fluff) goes with the little gray kitten (he nurses) I think the complete set sells for around the $20 mark?
the flea ridden cat goes to the care center playset....on her own couple dollars?
Apricot cat goes with blue carrier - she is a Ready To Go Pet (I love her) and I think I have seen her complete recently for closer to the $10 and under mark complete. I actually bought one for $5 recently.
The other apricot cat with the white stripe goes to a set with a Siamese cat and many other things. As she is alone I would again guess in the $2-$3 range? Single pets tend to be in that area unless they are more rare/variants.
white fluffy cat by himself I would venture up to $5
and the McDonalds pet....to me is cannon fodder. but I still think it sells in the $2-3 range as well.
you can look him up here:
http://petshopshoop.com/and then take his number and plug it into ebay. I have a hedgehog porcupine thing that I can't find...