[sureLoss]

Are you locked into the iOS ecosystem or are you willing to consider Android or Windows tablets? Also are you looking for a wifi only model or want wifi + cellular?

If your wife is more of a casual user or doesn't use a stylus for drawing/writing I wouldn't recommend the iPad pro and save yourself some money.

If all she is going to do is watch some movies and surf the web and some light gaming go with an Air 2. A Mini 4 might be good enough too if you want a smaller form factor, which might be useful as you say she is going to be traveling a lot.

I bought mine at the Apple store in Market Mall. It was a black friday sale a couple of years ago and they gave a $75 gift card with purchase.

iPads rarely go on sale and almost the same price at all official Apple retailers. Sometimes you can find refurbished models on Apple's website to save a few bucks.

If you are sticking with Apple, get the model with the most storage you can afford, because they can't be upgraded after.