When the kids were little, anywhere from $100-200 each. Our kids don't get presents from anyone other than us (or their friends, on occasion).
This year, my budget is a bit more.
DS is getting a WiiU (his request) plus a couple of games. His Wii is dying (that thing is like 10 years old), and he already has an Xbox 360; and we, as a family, have a PS4. (He wants an Xbox One also, but I'm only able to get one big thing for him this year.)
The older girls (both married and on their own) are getting copies of Julia Child's cookbooks, plus I'll catch some movies on
Amazon's BF sale for the couples. Something for the husbands (most likely the next couple books in the Dresden novel series, since we got them hooked on them).
We're also buying a carseat/stroller combination for DD#2, for the yet-to-be-born grandson. I've already started sending stuff (so far mittens and a teddy bear snuggy with Broncos on it).
DH wants a Windows tablet of some kid, and I want a new Kindle (the paperwhite will work for me, I just want it for reading; and my old Kindle won't keep a charge anymore).