Mod Podge is one a well known crafting supply. It’s an all-in-one glue, sealer and finish, used to attach paper and fabric to various surfaces. Its costs varies depending on the finish. An 8oz bottle costs about $7 (vs 8oz bottle of white glue $1-$3).
Homemade Mod Podge isn’t as strong or resistant to damage as the store-bought brand, but it will work as a great alternative. You may, however, choose to use the commercially made product for projects that will be heavily used.