You can find an invoice by signing into your account and heading to your My Account page. On this page click Manage on the Orders & Requisitions tile, which can also be found here. In the Orders tab at the top of the table, you'll see search options. Here, you can search your orders using a range of data including PO reference, invoice number, user who placed the order, date and status. On the results page, you can split by deliveries or products. Either will give you the option to view your invoice.