How much does a keg cost?
Depend what and where. Normally they charge you a keg fee. After paying that you can get them filled for 60+$.
That depends on what is in it and where you live. Some places have higher sin taxes than others.
You will probably have to have at least $100.00 ready... some of which is a returnable deposit
What size???? Full or empty?? If full, what brand.