Rendelni valahonnan. Vagy gyártatni itthon.

http://andybrown.me.uk/2011/08/28/512kb-sram-expansion-for-the-arduino-mega-design/

http://www.rugged-circuits.com/new-products/quadram

http://roman.stec.sweb.cz/Arduino_Mega_SRAM_expansion_shield_V2.html

Keress rá te is!