diff --git a/startup.lua b/startup.lua
index f88a083..de100c4 100644
--- a/startup.lua
+++ b/startup.lua
@@ -7,6 +7,7 @@ local price_map = {}
 local unit_name = nil
 local full_item_qoute
 local dirtied = false
+local currencies_override = nil
 term.clear()
 if monitor then monitor.clear() end
 local function tallyUpItems(price)
@@ -16,9 +17,11 @@ local function tallyUpItems(price)
     local worths = {}
     local minimum = 999
     for k,v in ipairs(currencies) do
-        worthmap[db.getCurrencyWorth(v)] = v 
-        worths[#worths+1] = db.getCurrencyWorth(v)
-        minimum = math.min(db.getCurrencyWorth(v),minimum)
+        if currencies_override == nil or currencies_override[v] then
+            worthmap[db.getCurrencyWorth(v)] = v 
+            worths[#worths+1] = db.getCurrencyWorth(v)
+            minimum = math.min(db.getCurrencyWorth(v),minimum)
+        end
     end
     table.sort(worths, function (a, b)
         return a > b
@@ -44,14 +47,14 @@ local function printTotal()
     printer.setCursorPos(1,y+2)
     local total = 0
     for k,v in pairs(total_items) do
-        printer.write("- "..tostring(k).." x"..tostring(v))
+        printer.write("- "..tostring(k).." x"..tostring(v).." - "..tostring((price_map[k] or 0)*v).." "..tostring(unit_name))
         local x,y = printer.getCursorPos()
         printer.setCursorPos(1,y+1)
-        total = total + (( db.getPrice(k) or 0)*v)
+        total = total + (price_map[k] or 0)*v
     end
     local x,y = printer.getCursorPos()
     printer.setCursorPos(1,y+1)
-    printer.write("Total cost: "..tostring(math.floor(total*100+0.5)/100).." "..tostring(db.getCurrencyUnit()))
+    printer.write("Total cost: "..tostring(math.floor(total*100+0.5)/100).." "..tostring(unit_name))
     local x,y = printer.getCursorPos()
     printer.setCursorPos(1,y+2)
     printer.write("Price in items:")
@@ -62,7 +65,7 @@ local function printTotal()
         printer.write("- "..tostring(k).." x"..tostring(v))
         local x,y = printer.getCursorPos()
         printer.setCursorPos(1,y+1)
-        total = total + (( db.getPrice(k) or 0)*v)
+        total = total + (( price_map[k] or 0)*v)
     end
     printer.endPage()
     print("printed the total!")
@@ -98,7 +101,10 @@ local function input()
                             local new_price = nil
                             repeat
                                 term.write("item price > ")
-                                new_price = 1/tonumber(read())
+                                local price = tonumber(read())
+                                if price then
+                                    new_price = 1/price
+                                end
                             until new_price ~= nil
                             ---@cast new_price number
                             if new_price > 0 then
@@ -190,7 +196,8 @@ local function input()
                 local x,y = term.getSize()
                 term.setCursorPos(1,y)
                 term.write("currency name > ")
-                added_currency_name = read()
+                local currencies = db.getCurrencies()
+                added_currency_name = read(nil,nil, function(text) return completion.choice(text, currencies) end)
                 if added_currency_name == "" then
                     added_currency_name = nil
                 else
@@ -235,6 +242,29 @@ local function input()
                 end
                 dirtied = true
             end
+        elseif event[2] == keys.b then
+            local currencies = db.getCurrencies()
+            currencies_override = nil
+            local running = true
+            while running do
+                term.write("add currency option> ")
+                local currency_name = read(nil,nil, function(text) return completion.choice(text, currencies) end)
+                if currency_name ~= "" then
+                    if not currencies_override then currencies_override = {} end
+                    currencies_override[currency_name] = true
+                else
+                    running = false
+                end
+            end
+            if not currencies_override then
+                print("cleared override")
+            else
+                print("created override with currencies:")
+                for k,_ in pairs(currencies_override) do
+                    write(k.." ")
+                end
+                print()
+            end
         end
     end
 end
@@ -299,6 +329,7 @@ t to get the total in the terminal.
 (not listing items)
 f to finalize the transaction.
 (and optionally print the receipt)
+b to override available currencies
 i to add or set the price of an item to the database.
 c to add or set the worth of a currency to the database.
 n to set the displayed currency unit.