We try to keep stockings small because all of the children get a lot of main presents anyway. So stockings are super cheap bits as that's just how we do Christmas and anything that's bigger will be wrapped up!! I never add up the amount though!
They all have a ton of chocolate and candy with a Christmas mug and then:
DD16: GRWM headband, fancy pen, navy nail polish, face masks, kiwi scented candle, fluffy socks, pack of highlighters, mascara, so spray and penguin sticky markers. Probably cost about £25 in total
DD16: Pretty similar but we did strawberry lip balm, claw clip, bath bomb, make-up brush and stud earrings in replace of a few things
DS13: Guitar pics, mini rubix cube, key-ring, fluffy socks, charcoal face mask, mini guitar book, swimming goggles
DD9: harry potter top trumps, scrunchie, hair clips, ink spy pen, star pop outs, fidget toy, lip gloss, squishie, hair bobbles and stickers
DD6: disney dobble, minecraft key ring, hatchimal, angel tattoos, disney purse, stick on earrings, minimakeup kit, glittery hair ties and glittery pen
I don't think any of them cost more than 20-25 pounds but we also end up wrapping anything that's over 10/15 quid anyway so they have a lot of main presents. Our stockings are also tiny so not lots can fit in there.