At work amongst our group of 10 including our manager did a Secret Santa.
We are a fairly close group, spend quite a lot of time together and I get on well with everyone (although I don't know my manager as well).
Our budget was minimum £20, and date of exchange decided a month ago.
I found a great gift for the person I was buying for, as they had briefly mentioned in conversation that they wanted it. They were very grateful and genuinely happy with their gift, which to me is much more important than receiving a gift. I get very excited when people open presents I have bought them!
Everyone else received lovely personal gifts, such as a new clutch bag, makeup, something related to their upcoming wedding, scarves, personalised gifts and candles.
My gift was a box of chocolates. It was not even wrapped, and was given in the carrier bag it was bought in, receipt still inside. The person had not spent even the minimum £20. Of course, I said thank you (although I don't know who bought them). It was quite difficult to be ecstatic about a box of chocolates though!
Other people in our department were admiring people's gifts, and when they asked to see what I got they looked a bit awkward and didn't know what to say 
I am not a difficult person to buy for- I have interests which the others are all aware of (although perhaps maybe my manager doesn't).
AIBU to be a little upset?