Website? Newegg Store? Try Staples. Don't buy these things, it's like spending hundreds on Photoshop. Just go "download" from somewhere.
If not microsoftstore.com then maybe bestbuy? Also, office 2013 is a quick download and you can easily that from MS. I got office 365 and I love it.
Good Luck, I tried to buy Access 2010 a few months ago and was unable to find it, I had to go with 2013. Your best best is ebay, or stores that no one goes to. I tried all the office supply stores and best buy and fry's to no avail.