I do have a Geforce GTX 260 896mb 448bit , but I know that can't be used for mining .

When I built this setup years ago it was meant to use 2 GPU's already, but I wasn't in the gaming mode anymore so I didn't bought a second one. But I need to go home to check the real capacity.

And I was at downtown here in my city and I couldn't find any graphic card to mining.

Any suggestions of alternative graphic cards to search in the stores?

I saw on amazon.com RX 470 for around $600,00 it's too much expensive right ?