local function OnEvent()
	for bag=0,4 do
		for slot=0,GetContainerNumSlots(bag) do
			local link = GetContainerItemLink(bag, slot)
			if link and select(3, GetItemInfo(link)) == 0 then
				ShowMerchantSellCursor(1)
				UseContainerItem(bag, slot)
			end
		end
	end
end

local f = CreateFrame("Frame")
f:RegisterEvent("MERCHANT_SHOW")
f:SetScript("OnEvent", OnEvent)

if MerchantFrame:IsVisible() then OnEvent() end