If by 250kb you mean 250kbytes, your best solution may be an SD card. Or use two of these 1Mbit chips http://www.onsemi.com/pub_link/Collateral/CAT24M01-D.PDF, or similar 1Mbit chips from other manufacturers.
is there any around 150 kbytes?
Memory always has a bit size that is a power of two.
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