About $3-5, depending on where I buy a few pieces of candy (robins eggs, M&Ms, Skittles or Starburst or Jelly Belly jelly beans -- all single serving sizes) and one small chocolate something.
We reuse the same basket that I have had for 20 years and I don't bother with grass of any kind.
DD's birthday is between Christmas and Easter. When I plan gifts before Christmas (most shopping is done on Black Friday), I include all three gift-giving occasions. This year, though, DD got her ears pierced for her 10th birthday and that was it in the way of gifts. (It was $75+ since I took her to a professional piercing studio and she chose titanium CBR earrings.) So, now I have a plethora of gifts that are mostly clothes and will need to be given sooner rather than later or she'll outgrow them (definitely cannot wait until next Christmas) plus some earrings since the timing is perfect for the healing period. The earrings are technically a set (5 or 6 pairs), but I am likely to give just one pair at a time. (They are a nice set of quality gemstone earrings that I got on overstock over a year ago in anticipation of her wanting pierced ears for her 9th birthday.) There is a game, too, but it might wait until next Christmas or move to the gift box for others. At her age now, I do not like to have a stockpile of gifts for her. Her tastes change more rapidly and she is more aware of hiding places.