If you were wondering how well the public would take to a Microsoft-made tablet costing $899 or more... quite well, at least from initial impressions. The 128GB Surface Pro has sold out at Microsoft's US online store, and checks suggest a lack of stock at both the company's retail stores as well as Best Buy and Staples. Canada is facing similar shortages at Best Buy and Future Shop. Not surprisingly, storage worries (since partly alleviated) have left the 64GB tablet as the only one in consistent supply, and we suspect that the 128GB model in Microsoft's Canadian store won't last for much longer. We'd be cautious before declaring the Surface Pro a runaway hit, however -- there's no word on how many units each store had, and Microsoft has refrained from reporting Surface sale numbers to date. Still, the early uptake is good news for Microsoft's first foray into designing an x86 PC, and it shows that many early adopters aren't hung up on the price.