But then, which applies for electronics in general: if you can buy it in low quantities, not per tube or minimal ordering amount of 250 Euro. Then if you completed your design, they take your selected chip out of production and replace it with a chip with changed and reduced capacities. And if possible with complete new to learn software.Thats kind of cheap. This part in Norway, goes for 37$ or something...
Chips: the nearest to Unobtainium you can get.
But cheers to Analog Devices: credit card orders directly at the factory, no minimum amount, 1/10th of retail price and speedy shipping from local warehouses!