Acer, when you make a purchase here or anywhere else on the internet, a page comes up confirming the purchase. I suggest you screenshot and/or print that page. That will serve as a receipt. Furthermore, you are given a purchase ID #. This is also proof of your payment and serves as a receipt. Also, if you have paypal, paypal stores your transaction records. Receipt. Oh yes, and paypal will send copies of your payment details to alternate email addresses. Just click to confirm them. Receipt. And finally, when you pay via bank card, your card issuer will issue you a receipt called a "statement" that is proof of purchase. How many more did you want?