Build more helium extraction plants in natural gas refineries.
Really.
The reason helium was (relatively) cheap was that the US built a nice large extraction plant at a natural gas field with a very high concentration of helium. That field is starting to run out, so prices are naturally going up.
Helium is not, however, limited to that one field. There are many other natural gas fields with varying concentrations of helium, and all you need to do is add a cryogenic helium extraction plant to a natural gas refinery to pull that helium out of the existing gas feeds. This is already happening in a few places, and with current technology, it's not that expensive to build more plants. It's only cost effective in a field with higher concentrations of helium - but there are quite a few of those.
The United States has proven helium reserves of about fifty years... and unproven reserves of about a thousand times that. ("Proven" means "we know it's there," and "unproven" means "we're pretty sure it's there, but haven't gotten around to it yet for economic or legal reasons").
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