A decent price for anyone looking to play this generation of Pokemon game and have Amazon prime to take advantage of.
Ruby and Sapphire are no longer in production for physical copies like this; most Pokemon games tend to increase in value, especially from this popular generation remake. It's currently being phased out by the respective digital download options via the Nintendo eShop; with little or no resale value.
Other major retailers inc eBay have them around £36+ with P&P. Tesco may state "low stock" but alot of people have had their games cancelled recently in light of the eCoupon discount,which is whom i assume Amazon is "Price Matching".