Jackson Browne (Saturate before Using) White Label Promo

Hello, just a quick question. Jackson's first album, how common is the stereo white label promo versus the mono white label promo? Can anyone give a ballpark price difference? Price being equal to rarity. Thank you for any information you can provide.
I already have a first issue, textured, top opening, copy that Jackson signed for me when we hung out in the 1990s. It was funny because he said that he never did get a first issue for himself. I tried to give him mine but he wouldn't take it. To this day he's one of the nicest, most genuine musicians I have ever met, and I have met quite a few.

Cheers!!