You can find a receipt for every order in your account under My Account → Billing → Order Receipts.
Find a receipt
Log in and go to My Account.
Open Billing.
Select Order Receipts. You'll see every recent transaction with its date, brands, amount and payment method.
Click View next to the order you need.
Good to know
If you order for more than one office, use the All addresses filter at the top right to show one location.
If you pay by invoice, your monthly statement is under Billing → Invoices. See When will I receive my invoice?
For refunds and credits, see How do credits work, and can I get a receipt for one?
