How do I combine these 2 scripts together?

It's kind of hard to understand what you're saying, but I think you either mean you want them both to run at the same time, or just want them as one script.

If you want them to run both at once, then you can convert the function into a coroutine. Example:

function hello()
	print("hi")
end

hello()

--that would turn into this VV

local hello = coroutine.wrap(function()
	print('hi')
end)

hello()

--using a coroutine allows you to run multiple blocks of code at once.

See here: http://wiki.roblox.com/index.php?title=Beginners_Guide_to_Coroutines

If you mean you want them to just be in one script, then you don't have to really do any work. Just put them in one script.

local ting = 0 --debouncer
owner = script.Parent.Parent.Parent.OwnerName --This is the thing that holds the owners name

function onTouched(hit)

    if ting == 0 then --debounce check
    ting = 1 --activate debounce
    check = hit.Parent:FindFirstChild("Humanoid") --Find the human that touched the button

    if check ~= nil then --If a human is found, then

        local user = game.Players:GetPlayerFromCharacter(hit.Parent) --Find human among the players
        if (user:FindFirstChild("House") ~= nil) then 

        local user = game.Players:GetPlayerFromCharacter(hit.Parent) --Find human among the players
        local message = Instance.new("Message") --make a message
        message.Text = "You already own a House" --Put text into the message
        message.Parent = user --Display message to new owner only
        wait(3) --Wait to let the message display for a while
        message:remove() --Remove the message from the new owner

        else

        local user = game.Players:GetPlayerFromCharacter(hit.Parent) --Find human among the players
        owner.Value = hit.Parent.Name --save new owners name for later.

        local own = Instance.new("IntValue")
        own.Name = "House"
        own.Parent = user


        local message = Instance.new("Message") --make a message
        message.Text = "You now own this House!" --Put text into the message
        message.Parent = user --Display message to new owner only
        wait(3) --Wait to let the message display for a while
        message:remove() --Remove the message from the new owner




        script.Parent.Parent:remove()

        end
    end

    ting = 0 --remove debounce
    end

end

script.Parent.Touched:connect(onTouched) --Start listening for button-touchers.



-------------------------------------
--Here is the second part

print("Shop Script Loaded") 

Door = script.Parent 
local debounce = false 

function getPlayer(humanoid) 
local players = game.Players:children() 
for i = 1, #players do 
if players[i].Character.Humanoid == humanoid then return players[i] end 
end 
return nil 
end 
function onTouched(hit) 
if debounce == false then 
local human = hit.Parent:findFirstChild("Humanoid") 
if (human == nil) then return end 
local player = getPlayer(human) 
debounce = true 
if (player == nil) then return end 
local stats = player:findFirstChild("leaderstats") 
local sp = stats:findFirstChild("Money") 
if sp == nil then return false end 
if (sp.Value >=0) then --Amount of how much the weapon will go for
sp.Value = sp.Value - 0 --Put the same exact number here as you did above
print("Enough Money") 
game.Lighting.Keycard13:clone().Parent = player.Backpack --Change NAMEOFTOOLHERE to your tool name
Door.BrickColor = BrickColor.new(37) --MAKE SURE YOU PUT THE WEAPON INTO LIGHTING
wait(2) 
Door.BrickColor = BrickColor.new(21) --Leave the rest of this alone
debounce = false 
else debounce = false 
end 
end 

end 

connection = Door.Touched:connect(onTouched) --

Nothing much would change. If this helped, please accept the answer. Thanks