I bonds are a great place. Currently earning 3.57% and will go over 6% on November 1st. Can't pull the money out the first year and there is a interest penalty if withdrawn in the first 5 years. The negative? One can only put in $10k a year per person ($20k if married-each need their own account). There is a small loophole where you can invest your tax refund into the I bonds, but that amount is (hopefully) not a huge amount.
Individual - Series I Savings Bonds