You are working for free and giving these cookies away. The prices you are asking will pay for your gas only. Think about using the trifecta pricing system:
1. Ingredient Costs
2. Labor Costs
3. Overhead costs
So, for example, let's use $1 for each of those costs. That equals $3, multiply that by 6 and you get $18. The "multiply by 6" concept is used in restaurants nationwide as a standard for pricing items on their menu. You probably do not have a restaurant, but this model is a good tool to use for pricing of food.
When you get more orders, this will also help you in the long run for price consistency.
Good Luck...sound like you are going to have fun with these cookies!