What color is that leather? White? Off white? Pearl white? Amazon has a bunch of leather for sale by the yard, but without knowing exactly what type and color it is, you're going to be hard pressed to match it exactly. Someone on an infinity specific website might have a better idea if nobody here owns one and knows what it might be.
"stop with the REINSTALLS, what do you think we got some lame-o installer!!!" - mitchjs
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It's tan. Infiniti will charge an arm and leg. All the fabric stores I found want to sell me WAY more than what I want, and for the price they are charging it simply isn't worth it. I see a couple things on ebay and amazon...actually seems to be by the same person...that I'll check out, but the colors don't seem too promising.
Any time you buy fabric, you'll have to buy a minimum quantity. There's no getting around it, unless you do what tft recommends. And I wasn't recommending you buy from Infinity, merely that you get the exact color of the leather from them.
You should hit some Infinity forums to see what other owners have done to get leather matched and where they bought it.
google "leather near <zip code>" using your zip and if there are leather stores near you (I have a couple near me, in Portland) then you can buy leather by the square foot. They measure it with right angles and you get the odd shaped edges for basically free, so if you can find the right shape of leather, you can get it for crazy cheap