How do you teleport a model infront of a player??

workspace.FilteringEnabled == true, or naw?

I'm going to assume that it's false. Since you're dealing with a model here, I'd first deal with its PrimaryPart if you haven't already. It's pretty cool.

Run this in the command line:

Car = game.ServerStorage.Enter_Your_Car_Name_Here.PrimaryPart Car.PrimaryPart = Car.Engine

You must set the PrimaryPart to any part that's inside your car (whether it is the car's child or descendant) to "teleport" the car. The PrimaryPart property allows you to use these two methods: :MoveTo() and :SetPrimaryPartCFrame()

Note that I defined your car in game.ServerStorage. Please get into the habit of placing your stored models in game.ServerStorage, because that's what it's meant for. Storage.

-- LocalScript
Player = game.Players.LocalPlayer
Leaderstats = Player:WaitForChild("leaderstats")
    Money = Leaderstats:WaitForChild("Money")
Character = Player.Character or Player.CharacterAdded:wait()
HumanoidRootPart = Character:WaitForChild("HumanoidRootPart")

Car = game.ServerStorage:WaitForChild("Enter_Your_Car_Name_Here")
Button = script.Parent

Button.MouseButton1Click:connect(function()
    if Money.Value >= 100 then
        local newCar = Car:Clone()
        newCar.Parent = workspace
        newCar:SetPrimaryPartCFrame(HumanoidRootPart.CFrame * CFrame.new(0, 0, -10))
        -- Teleport the newCar to 10 studs in front of the character
        Money.Value = Money.Value - 100
    end
end)

This is the basic layout. This is could've been scripted better, but this is to give you the general idea.

If FilteringEnabled is set to true, then consider learning and using these objects.