Hmmm..... I will go by price from each line I collect.
Star Wars 3.75 - $250 on Millennium Falcon, thing is huge and is very awesome. As far as single figure goes.... probably around $50 for Revan.
Star Wars 6" - $40 on Black Series Vader, then $30 on Black Series Yoda. Rest have all been under $20
Transformers - $100 on Omega Supreme, that will soon change as I plan on making more MP purchases to come.
WWE Mattel 6" - $100 twice. Ringside Exclusive Kane and a Custom Goldberg. The Kane I feel pretty stupid for paying that much, Goldberg was good value but leg broke off. Next most was $80, $55, then the rest are under $30, majority are at retail price of $20 or below.
Funko - $10
Might spend a little bit more for a exclusive. $20 is my limit on these now.
Marvel Legends - Soon to be $75-80 on a BAF Hulkbuster.
Walking Dead McFarlane - Soon to be $110 on Negan (pretty mad I passed on him for $30... will come to bite me soon)
SSC Star Wars - $250 on Grievous.
Hot Toys - $350 Hulk and Banner Set. Single figure is $300 for Mark 42.
Statues - I have the Batman Dark Knight PF on PO, so, that will be my most expensive piece.