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Prepaid credit cards can be bought at many drug stores and convenience stores, however, they do cost money to buy them (10$-30$).
They don't require any ID, and you can use them at websites like a regular debit/credit card. Also as long as you don't exceed the amount on the card, it's the same as a normal credit card.
Regarding the cost of money orders, it would be wise to check the website of the place you are buying them from, and seeing if they list the price of the money order.
You can get them at convenience stores, drug stores, post offices, banks, or money transfer places like Western Union.