Where can I buy SMC256AFB6E?

SMC256AFB6E is available from Digi-Key, Hotenda. See pricing comparison above.

SMC256AFB6E Micron Technology Inc. | Memory Cards, Modules | DigiKey

Brand name, Manufacturer name, Manufacturer, Attribute01	Micron Technology Inc.
Attribute00	Memory Cards, Modules
Attribute02, Attribute07, Attribute08, Attribute09	-
Attribute03	Tray
Attribute04	Obsolete
Attribute05	CompactFlash?
Attribute06	256MB
AttributeKey00	Category
AttributeKey01	Mfr
AttributeKey02	Series
AttributeKey03	Package
AttributeKey04	Part Status
AttributeKey05	Memory Type
AttributeKey06	Memory Size
AttributeKey07	Speed
AttributeKey08	Technology
AttributeKey09	Operating Temperature
Extra Product Name	SMC256AFB6E Micron Technology Inc. \| Memory Cards, Modules \| DigiKey
atoms, moq, multiple	1
extraShipping, qtyInStock	0
MPN	SMC256AFB6E
SKU	1009721

Seller	SKU	MOQ	In stock	Multiple	Prices
Digi-Key	1009721	1		1
Hotenda	H2837107	1		1