Is there an expiration date for when the card is no longer valid?

No. I"ve bought these from NewEgg several times. They have the expiration terms at the bottom: " 2EXPIRATION DATE: Does not expire". I'd print it if you don't expect to use it soon, just to ensure you don't have a problem getting access to the card when you need it.

Do Lowes allow one to use more than one gift-card in a single purchase?

Yes, online up to 5 at a time. Instore, I do not know.

Questions & Answers: Lowe's $50 Gift Card (Email Delivery)

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Lowe's $50 Gift Card (Email Delivery)

Lowe's offers everything from power tools and appliances to lighting and home decor. The Lowe's eGift Card can help start any home project large or small
"Send as Gift" Function Available Upon Receive of the Gift Card. Customizable Name and Personal Message
Print Card or Store to Google Pay / Apple Wallet

$50^.00 –