The Explorer version of Google Glass is back on sale again--and this time Google isn't limiting purchases to a strict 24-hour period like it did in April. In a Tuesday post on its Glass Google+ page, Google explained that it's "decided to move to a more open beta," inviting anyone who lives in the U.S. to join the Explorer program "as long as we have it on hand."

Interested? Gather up $1500, amble on over to the Glass page, and walk through the shopping engine, choosing your color, and then picking either new Titanium Collection prescription frames or impact-resistant shades.

In its announcement post, Google is careful to note that it's still looking for feedback from Explorer beta testers ahead of its wide consumer release.