Thanks to everyone for your help with my Amazon issue. I'm posting what 
worked for me in case others have trouble changing quantities on the 
Amazon website. What's interesting is that the suggestions I got 
reflected a different shopping cart from the one on my screen. What I'm 
going to describe is true on both Amazon.com and Amazon.com/access.

1. the easiest way to change item quantities in the shopping cart is to 
press enter on the Proceed to Checkout button. When you're on the screen 
that shows the total, shipping, and other order details, the quantity is 
an ordinary combo box, so you just press alt+down-arrow to open it and 
press up/down-arrow to select the right value, hitting tab when you're done.

2. If you're on the first Shopping cart screen, before pressing enter on 
the Proceed to Checkout button, each item in the cart has a Quantity 
button followed by a Quantity link. The Quantity button is set to 1 by 
default. Using Jaws to activate it doesn't work here. Using NVDA does, 
though it's glitchy (not sure if the problem is the page or the screen 
reader). With NVDA, you can press enter on the quantity button, wait a 
second or two for the page to refresh, then arrow up/down as you would 
through a combo box. When you're at the number you want, press tab.


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