What is a good way for someone to purchase Mining Bonds? GLBSE is down, and so is PureMining, which used to give deterministic hash rate yields.

What are the alternatives? If someone wants to invest in Bitcoin mining, but doesn't want to own &amp; operate a mining rig, what is a good way for him to do this?
You could use https://btct.co/ which is a virtual stock exchange similar to GLBSE.