The tape should be dirt cheap. Often sold as slug-repellant tape on Amazon or eBay, but shielding is often mentioned. You should be able to pick up a long reel of 1" or 1.25" wide tape for around $10. Just make sure it's stated it has a conductive adhesive.

e.g. https://www.amazon.com/KAISH-Conduct...s%2C151&sr=8-3