Given the prospect of Darkness providing a useable testing area (hopefully), I'll be so kind to share a coupon simulator with you. Obv, inelement allowed totals and percentage will be calculated for time given the basis I worked on (for total points this is irrelevant though and its easy enough to change this yourselves) and this is not the version that I myself use and you cannot edit it (this is for your own good really, dont want everyone to see your vault).
Instead, while being logged into a gmail-account you click on File -> Make a copy to get an editable copy.
Put the cards you want in VaultCostCalculator, the cards will automatically be transferred to the three sheets for simulated coupons. You can then see the total costs in the respective sheets.
Enough talk, here is the link to the spreadsheetSome copypasting errors may have occured, please point them out!
However, no you are not allowed to complain about the bg color being a little inconsistent due to copypasting!