Best place to invest/save funds for 4 to 6 months period

[Kay Kay]

Considering inflation, it is not safe to have funds sitting in the bank.

I have to save/accumulate funds for a down payment - I already have $30K - Will add 5K every month

Any thoughts? 

Criteria:

1. It should be easy to liquidate for down-payment

2. Beat inflation or at least 5% and above

3. Medium - Risk

Options:

Any good income producing mutual funds, ETF, REITs?

I Bonds are having 1 year lock