To find a receipt for one of your TpT purchases, go to your My Purchases page. Next to each purchased item, you'll see a "Printable Receipt" link to the right of the purchase date. Each receipt includes all of the items purchased in that order.
If you want a full list of all the items you purchased in a year, we have that too! Just head to your My Account page and select the Purchase History tab. There you'll find downloadable annual purchase statements for the current and previous year.