It's true that cupcakes are cheaper than a full wedding cake and if you choose to bake the cupcakes yourself, you'll save even more. However, not everyone can or likes to bake. You can cheat and use a cake mix from a box but you run the risk of having them taste a little artificial. However, if you follow the simple recipe that I've posted below for you, no one would know they weren't baked from scatch.
Step 1: Look at the directions on the cake mix,
Step 2: Add one more egg (or add 2 if you want it to be very rich),
Step 3: Use melted butter instead of oil and double the amount,
Step 4: Instead of water, use milk.
Step 5: Mix well and bake for the time recommended on the box.
I found this recipe at Fabulessly Frugal!!