The move follows last month’s one-day sale for the wearable computer, which is still in beta form. The company said it nearly ran out of stock due to “overwhelming” interest. It has since built its inventory back up and is looking for ways to accelerate and expand the program. A consumer version of the device is expected later this year.

Google (GOOG) started its “Explorers” program about two years ago when it first launched Glass in order to refine and improve the hardware and software supporting its internet-connected glasses. The search engine giant decided to expand the program by allowing anyone in the U.S. to buy the Glass Explorer Edition, at least until stock runs out.

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Prior to the full consumer launch, Google hopes to attract a broad range of new beta users of Glass who “can get in early and help make Glass better.”

Anyone who purchases a pair of the $1,500 glasses will “help shape the future of Glass,” according to the company. Buyers can choose their color, earbud type and frame style, which includes options for prescription lenses and sunglasses.