I have cut down my spending because I look back and don't really need a lot of the stuff I got and it's just taking up room. They will let you stick stuff in your cart and keep it there. That's what I do. It's empty now.
No, I don't think cookie dough is a good idea. Look up some gingerbread recipes or get a couple mixes (or more) at Walmart. I love gingerbread with whipped cream. It's a little different from cake texture but would probably work better than cookie dough which is too thick. I think it would bake on the outside and stay uncooked dough on the inside.
My superstore has this, yum. You would put different amount of liquid in for cookies than you would for cake. If you make it from scratch, which I have never felt a need to do, some recipes use hot water.
They also have house mixes, you could look up what yours might have if you just put in gingerbread. Unless yours isn't online.
My other store doesn't seem to carry gingerbread mix. I think Krustaetz (sp?) makes one; their stuff looks good but never tried it. I used to buy Pillsbury. I loved the taste and convenience of it. Just mix with water and bake in ungreased square pan (I prefer glass).