I am, bored so I just felt like writing up all the prices of the super rares in era I may have some inaccurate prices etc but oh well :p the prices i got were collected from people who i have asked randomly on era. The prices will be in shells because that's how everybody prices them :o ikr... 2 types of currency... Anyway here's some prices:

+ = Price Increasing
~ = Price Decreasing

Umbrellas:
Black Umbrella - 30k ~
Green Umbrella - 70k +
Pink Umbrella - 80k +
Blue Umbrella - 90k +
Red Umbrella - 110k +
White Umbrella - 150k +
Jeni's Umbrella - 150k ~
Purple Umbrella - 300k +
Golden Umbrella - 350k +
Rainbow Umbrella - 600k +

Trashpicks:
Syringe - 11k ~
Cigar - 14k ~
Yellow Pencil - 16k +
Pen - 130k +
Skateboard Trashpick - 55k +
Plunger - 60k ~
Paintbrush - 100k ~
Spear - 70k ~
Bone - 70k ~
Thermometer - 65k ~

Candy Melees:
Chocolate Dagger - 20k +
Ice Cream Dagger - 16k ~
Marshmallow Dagger - 24k ~

Items:
Egg Hacky - 500 shells +
Egg Dance 500 shells +
Taser - 6.5k ~
Superfart - 9k ~
Skull juggle - 10k ~
Toy Bat - 7k ~
SPD Fart - 11k ~
Panda Hug - 13k +
Droppable Hat - 350k +

Flags:
SNK - 1k +
M4M - 1k +
Jatz - 1k +
Small USA - 600 shells +
Lebanese - 12k +

Others:
Clover - 1.5k +
SPD Sword - 1k +
SPD Dagger - 2.5k +
Graalians Hammer - 45k +
La Chancla - 50k ~
Bunny Hammer 60k +
Toy Hammer - 110k ~
Green Drag Sword - 120k +
Red Drag Sword - 120k +
Heart Axe - 25k ~
Pink Sapphire Dagger - 35k ~
Taco Hammer - 60k +
Ice Blade - 40k +
Pickaxe - 230k +
Panda Hammer - 320k +
Noob Trident - 400k +
HW Dagger - 380k +
Pepper Pickaxe - 110k ~

Unknown:
Nutella Hammer - ?
Kuroneko Umbrella - ?
Brown Umbrella - ?
Orange Umbrella - ?
Zombie Morph - ?
Super Mushroom Knife - ?
Flamecrow Wings - ?
Giant Katana - ?
Golden Katana - ?
Golden Flower Basket - ?

This may not be 100% accurate information but it's a brief view on how much a super costs in shells.