It is only valid in-store, and the only exclusions are Kindle and Beats audio products.
YES, it works on computers!
So if you guys have a Staples employee in the family, 10% extra off one of the sale laptops is very nice
Here is the fine print:
"10% Instant Discount
Starting February 1, 2011, associates get a 10% instant discount on ALL in-store purchases including computers, laptops and tablets!* Just show your Associate Rewards card or member number every time you shop to receive your discount."
"Valid on in-store purchases only. Limit $5,000 in discounted purchases per calendar year. Limit 2 computers or laptops per calendar year. Gift cards, postage stamps, sales tax and state fees are ineligible for the 10% instant discount."