RE:Helium-3I did a quick Google Search for helium 3 and found:
At $1400 per gram, one hundred kilograms (220 pounds) of helium-3 would be worth about $140 million. One hundred kilograms constitutes more than enough fuel to potentially power a 1000 megawatt electric plant for a year when fused with deuterium, the terrestrially abundant heavy isotope of hydrogen.
It is also the only stable isotope of an element with more protons than neutrons! Good work Bertie20. DME would probably need some sophisticaed separation equipment to isolate the helium-3 and would probably sell the raw gas to an interested party.