My daughter is O-B-S-E-S-S-E-D with Toy Story and ebay is juat a treasure trove for goodies.
Im a single mum, I dont have a great income ans disney store prices bring a tear or several to my eye.
The best way ive found for toys in general, but especially with Toy Story is filter filter and theb filter again.
I always search a small radius and sort by near to me, price range is a must (stops the temptation of overspends)
Postage is sometimes extortionate, £6.50 for a teddybear that turned out to be round the corner to me! I check the town and drop the seller a message asking if I can collect or if they are uncomfortable possibly meet in a public area and do it that way, if they say no well then you have to weigh the cost of postage against how much you covet it.
Toy story is old... like came out when I was a little kid old, and ebay is amazing for second hand but good quality characters, accessories even bed room sets!
Many collecters are just bored, disenchanted or just plain dont want their stuff anymore. Always read descriptions, zoom in on photos and ask questions. Anyone wanting to sell a good item will answer all your niggling questions, and if it turns out its not 'mint in the box, never been opened' at least you have the mesage to show ebay that Al from Als toy barn swore on his grandmother it was.