All non Lemons-branded merchandise is shipped directly from the respective manufacturer.
Shipping status is not updated on the Lemons store site (so, if you're worried that an order you placed is still shown as "processing," chances are it has already shipped--that status is not updated online).
Contact the manufacturer directly for shipping status, and let them know you placed the order through the Lemons store:
24 Hours of Lemons
ATL Fuel Cells
SPA Technique (via Zimmerman Motorsports)