I have a leaky camping sleeping pad to offer for free It's marked a R A / Warranty item as the company choose to send a replacement pad and also asked me to mark the old, leaky as RA / Warranty.
At this point, I just want to give it away. It still has a foam structure internally, but loses air overnight. You may find success patching it - I didn't try.
It makes an solid secondary pad to increase R value on a cold night under a primary pad. This is because even without air, it's still has a foam internal structure and the internal reflectivity to create insulation.