Looking for Eagle Fish Elite 502c card

[Luremaker]

I have a brand new 502c fish-elite that I bought a few years back. Since this is a older model, what chip or card should I be looking for. I know the new ones won’t work, since there is not enough memory in the 502c. I was told nothing bigger than 1GB. Does anyone know where to get one for the Eastern U.S., or does anyone have one for sale. Thank you