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Seems that the second volume isn't being printed anymore. Yen Press's official listing of it doesn't show the physical version available anywhere.
Well I did manage to find this on amazon
Is this the Aincrad arc manga?
The manga is available for purchase here
The first manga on the shelf here is the Aincrad arc. It basically covers the first Light Novel, but includes the Yui story. Doesn't have the rest of the short stories from volume 2 of the Light Novels. Here's the link to amazon for the volume. https://www.amazon.com/Sword-Art-Online-Aincrad-manga/dp/0316371238/ref=sr_1_1?ie=UTF8&qid=1543081114&sr=8-1&keywords=Aincrad+manga