How do I make a teleport brick?

Your code was this:

function onTouched(touch)
        if player.leaderstats.Cash.Value >= 100 then
            plr = touch.Parent:findFirstChild("Humanoid")
        if plr ~= nil then
            plr.Torso.CFrame = CFrame.new(-404, -12.5, 402)
        end
    end
script.Parent.Touched:Connect(onTouched)

The code is meant to be this:

script.Parent.Touched:Connect(function(hit)
        local plr = game.Players:GetPlayerFromCharacter(hit.Parent)
        if plr.leaderstats.Cash.Value >= 100 then
            hum = hit.Parent:findFirstChild("Humanoid")
        if hum ~= nil then
            plr.Parent:MoveTo( --Your End Part )
        end
    end
end)

Firstly, I'd suggest making an end part (a part that the player will teleport to)

Secondly, the Humanoid is in a player's Character, not in the Player itself!

Thirdly, you're picking up the "plr" completely out of the blue. You have to get the player, not just magically reference it!

Here's the fixed code for ya:

local endpart = game.Workspace:WaitForChild('endteleport')
local startpart = script.Parent

local coinsneeded = 100

startpart.Touched:Connect(function(touched)
    local char = touched.Parent
    local plr = game.Players:GetPlayerFromCharacter(char)
    local coins = plr.leaderstats.Coins.Value
    local humroot = char.HumanoidRootPart

    if coins >= coinsneeded then
        humroot.Position = endpart.Position
        print('Teleported '..plr.Name' successfully!')
    else if coins < coinsneeded then
            print(plr.Name..' does not have enough coins to enter the teleporter!')
        end
    end
end)