>mutual funds
Vanguard offers many low-fee mutual funds.Non-depreciating: The long-term return of stock indices and some bond indices beats inflation.
Attainable: $1000-$3000 minimum to open an account
Liquid: Funds can be bought or sold easily (with no fee), money is accessible via ACH.
I hope you are not suggesting that gold is a better investment than a diverse portfolio of stocks and bonds.