buyers say my amazon listing shows no price

Check it logged out, from a different browser, and with a delivery address in another state. If the price shows for you but not for some buyers, your shipping settings probably exclude their region, so Amazon has nothing to offer them. Seen that a few times after people edit shipping templates. Other thing: if you set a max price in your pricing rules and the price ends up above it, the offer gets deactivated.

That usually means nobody has the Buy Box, so the page shows "see all buying options" instead of a price. Check Manage Inventory for that listing: if it says inactive or there's a pricing alert, Amazon has pulled the offer, often because your price is too far above what they think is fair (theirs or other sites). Lowering it a bit or fixing the price issue in that alert normally brings the price back within a few hours. Also make sure you actually have stock and it's not stranded in FBA.