The cheapest thing to do is either make recipes of your level that are High chances of success and Cahce ingredient and gold shop items
or
Make lvl 1 recipes that require only chache ingredients.
The recipes that are 1 level below you almost always create themselves within 1-3 tries, even if they say their odds of success are low.
You get less EXP for them, but it makes it much cheaper in the long run if there aren't any recipes at your current level that use shop items along with cache components. (buying old RIG items is just expensive!)