Hi Alejandro,
Yours is a very good question. I have the Cold Steel SRK (Survival Rescue Knife). It is a very good knife and the price is not bad even from Cold Steel. You can do a search and find it at even a better price, about $60 or so on some sites. For a second, about $50 with only cosmetic slight blemishes. You could do a LOT worse in a very tough knife.