Today's Amazon hint

Use your wishlist for things you want, but are currently too expensive.

Check back every couple of days to see what the price is at the moment.

Yesterday, a long out of print book I've been after for about thirty years was available for under £3, instead of its usual £80+. It could be a mistake - and despite the Amazon terms and conditions saying 'tough' to marketplace vendors who misprice items, they don't actually enforce this - so I'm not holding my breath, particularly as the vendor is a company in the US.

But... (potential) result!