For the second time in about a month, Google is opening up the sales of its Glass to the public. Assuming that you have $1,500 to spend, this heads-up display could be yours, according to a Google+ post. The first time Glass went on sale, Google claims that demand was so high, \we almost ran out of inventory and had to close things down early.\ The search giant is presumably making a killing on its expensive headset, considering that it costs less than $80 per pair to make, according to a tear down by TechInsight.