You can find all of your RocketHub purchases (and associated invoices) through the "Products" page of your RocketHub Account.
Here's a walkthrough of how to do so:
Select "Account" from the navigation bar at the top of the page
Click on the "Products" tile
To view your invoices, click the "View purchase history" link. From there, you can click on any of the individual Invoice IDs to access your invoices per purchase/transaction
If you purchased more than one code of a particular deal, you'll notice that each product listing on the "Products" page represents a single code (so you'll see multiples of deals you've purchased more than one code for).
You can use the "Filter:" dropdown menu to sort through your Active, Not (marked) Redeemed, and Refunded products.
The "Actions" dropdown menu to the right of each product allows you to view the product's deal page, redemption instructions, invoice, and webinar replay, initiate a refund, and even refer the specific product to a friend.