Initial price at time of release of card. Highest price for best model (maximum memory, added various modules..). Chipsets and mobile variants have price for 10 000 chips (without memory and other parts).
These articles will show charts made from data in articles. They're loaded from database, so mistakes might happen if some author used wrong numbers or table row in card article. All values are theoretical and apply to reference models of cards. It's impossible for me add there various submodels like over/under clocked cards or with various memory bus width. Don't like empty article here, so we start with number of transistors chart.