making a player-run shop. can't save the items.

[Carmine3777]

I'm tying to make a player-run shop, but the values won't save. I can get them to appear on there but when I close it, it disappears. here's a portion of my code:
[lua] local PlayerShop = vgui.Create( "DPanel" )

local DermaListView = vgui.Create("DListView",PlayerShop)
DermaListView:SetParent(PlayerShop)
DermaListView:SetPos(0,25)
DermaListView:SetSize(450,450)
DermaListView:SetMultiSelect(false)
DermaListView:AddColumn("Item")
DermaListView:AddColumn("Seller")
DermaListView:AddColumn("Price")

--for k,v in pairs(Sales) do
-- DermaListView:AddLine(v.Item,v.Seller,v.Price)
--end

local Sell = vgui.Create("DPanel")

local WangLabel = vgui.Create("DLabel", Sell)
WangLabel:SetText("Price")
WangLabel:SetPos(50,40)
local Wang = vgui.Create( "DNumberWang", Sell )
Wang:SetPos( 50, 50 )

local Text = vgui.Create("DTextEntry", Sell)
Text:SetText("Object")
Text:SetPos(50,100)
Text:SizeToContents()

local button2 = vgui.Create( "DButton", Sell )
button2:SetSize( 150, 50 )
button2:SetPos( 50, 200 )
button2:SetText( "Complete Form" )
button2:SetParent( Sell )
button2.DoClick = function( button2 )
surface.PlaySound( "ui/buttonclickrelease.wav" )
DermaListView:AddLine(Text:GetValue(),ply:Nick(),Wang:GetValue())
end[/lua]
as you can see, I'm making a list which gets it's values when a player clicks the "Complete Form" button. it works, but it doesn't save the values. I'm trying to add a table, but I don't know how I would do it. any suggestions?