well if you want to learn piano,buy used piano
I dont know how prices vary in your country and how cheap they are but here in Croatia,where I live you can buy used piano under 1000 dollars,dont put limitation on how many keys,buy 88 keys no matter if you buy piano or other keyboards! you have on ebay or amazon very cheap stage pianos,buy them,they are very practical if you have no space in your living place! casio and rolland have very cheap stage pianos, I saw prices for 200 dollars,but I saw even cheap kurzweils or korg! it is always best to pay lessons to some teacher who lives near you then any advice that you find on many forums and above all, be patient