You can buy a 6mo treasury on the secondary market at any broker (trade -> fixed income -> search -> treasury -> maturity -> sort by Yield to Maturity -> depth of book -> buy) that yields 4.5-4.6% , state tax free. That's more convenient, and easier, than dealing with AFCU. I just (a few months ago) broke my 3% CDs with Andrews to buy ibonds. They're not so bad to deal with as some CUs, but at this point I recommend sticking with Treasuries until the rates no longer make sense.
You can also get a brokered CD earning 4.9-5% on any brokerage, for up to 5years, right now, but again there's state tax on those