They sell both piezo-kinetic ones and battery powered sparkers. Yes. I have bought them to make potato guns.
Can you find Lowes / Home Depot in the phone book / on the internet? L
I'd either call them direct, go and ask an associate or at least look at their stock on the internet. I know they have them but I don't know if they are in stock right now.
Do you mean handheld, or the version which installs into a panel on the grill?For the latter, I'd try contacting the manufacturer and asking where youcan buy replacement parts locally, or if you can mail-order from somewhere.