Price shows in one "Click Here To See Price" pop-up, but not in another?

I'm trying to comply with a manufacturer's MAP policy by having the pop-up windows showing the actual price when a user clicks on the "Click Here To See Price" link. The pop-up MAP window shows the real price on the catalog page (page with several products), but not on the individual product page. The pop-up window on the individual product page shows the explanatory text, but there's no price.

Does anyone have an idea as to what the problem might be?

Thanks for any replies.