What is the best way to find which games have 50%+ craftable coupons?

Random question, but I sometimes use the coupons I get from crafting badges for new games. However, without actually crafting the coupon myself, its difficult to tell which games currently have craftable coupons (only the good ones for 50-90 % off, of course).

So... does anyone know of an updated list of all currently 'possible' coupons from crafting, ideally linked to a users wishlist? I'm happy to trade a little bit of metal or a card or three for decent coupons, but its incredibly hard to search for those without knowing the current crafting list - and the free sites / trashbots I've seen have too much mooching competition to be of any use.