Modern Coin Mart via eBay offers the American Eagle 2013 $5 Uncirculated 1/10-oz. Gold Coin for $142.95 with free shipping. That's $14 under our July mention and the lowest total price we've seen. (It's a current low by $112.) It contains 1/10 troy oz. (3.1 grams) of pure gold.
Note that gold is currently trading at $1,225.50 per troy ounce. All sales are final and this item can't be returned.
Most taxpayers will see their tax bill go down during 2018. That could impact which type of account -- traditional or Roth -- makes sense for you.