I have used Microchip's EEPROMs before and you can find them at any major distributors. This one for example is a 4K EEPROM (SPI) at DigiKey: http://parts.digikey.com/1/parts/536330-ic-eeprom-4kbit-10mhz-8soic-25aa040a-i-sn.html
I have used Microchip's EEPROMs before and you can find them at any major distributors. This one for example is a 4K EEPROM (SPI) at DigiKey: http://parts.digikey.com/1/parts/536330-ic-eeprom-4kbit-10mhz-8soic-25aa040a-i-sn.html