I opened this thread to see what you were selling!

If you're buying raw, then common-date Coronet Head half eagles in EF or AU should be only slightly over spot. Look to pay around $370 or less for these and ask around, some should be available. There's .242 troy ounces of gold in a half eagle so melt is about $322 today.
Quarter eagles always sell for well above their melt price unless damaged. There's $161 in gold in them but finding a decent one for under $200 might not be possible. If you're willing to go $210-$220 you should be able to find an acceptable, circulated example. Indian Head $2.50 will likely be more though.
As you move to Eagles and Double Eagles, the percent over melt for common dates becomes a bit better for the buyer. I would consider a $10 Liberty Eagle. They contain almost 1/2oz of gold and can be found in raw, circulated condition for around $700. With $665 in gold here, that's a good way to go.
Best of Luck!