Screenshot by Lance Whitney/CNET

Missed your chance to buy a pair of Google Glass yesterday? Sorry, you're out of luck, at least for now.

Google offered its $1,500 high-tech specs to anyone in the US on Tuesday without requiring the usual invitation. The sale lasted just 24 hours. The white , and as of Wednesday morning, the entire stock is gone.

"We're out of spots in the Explorer Program for now, but may have more to share soon," Google said on its Glass sign-up page. The company asked people to fill out the sign-up form to stay abreast of the latest Glass news and be notified if a spot opens up to purchase the wearable device.

Prior to Tuesday's sale, the current Explorer version of Glass was available only through a special invite. That option isn't going away. In fact, despite Tuesday's sellout, people will still be able to buy Glass through an invitation, a Google spokeswoman told CNET.

"We were getting through our stock faster than we expected, so we decided to shut the store down," the spokeswoman said. "While you can still access the site, Glass will be marked as sold out. We are leaving the site open so Explorers can still get any accessories they need."

Google has slowly but surely been expanding the Explorer program, as evidenced by the one-day sale.

"To discover new places, sometimes we need to leave the map behind," Google said on the Glass sign-up page. "And that's what Glass Explorers do. They are the first to make, to tinker, to create, to shape, and to share through Glass. We're expanding little by little, and experimenting with different ways of bringing new Explorers into the program."

And for those of you hopefuls who haven't yet made it into the Explorer program, don't fret. Google has been prepping a less costly consumer version of Google Glass that could hit the market by year's end.