Am I being overdramatic

I feel like my husband is playing favorites right now. I totally could be projecting but I need to know. See. I grew up in a home with parents who clearly liked boys and preferred my brothers. I never wanted to be like that. I have 4 kids. 1 son and 3 daughters. My son plays the Viola in orchestra. His orchestra class went on a trip to Rome during winter break. He begged for it and it was 4000 trip. Me and my husband said yes but told him to understand this would be his Christmas present. He said okay. He worked really hard. He was second chair for Viola so we did this to him. But me and my husband made it clear it would be his one and ONLY Christmas gift. They had a great time. They would be playing with a symphony in Rome for 3 nights and my son got sick in Rome so he couldn't do the last night. Besides getting a stomach bug he had a great time. He came back yesterday and my husband gave him a wrapped gift. It was a manga. My husband said Barne and Nobles was having a sale and he got is and said Marry Christmas and welcome back. I immediately got pissed. We told him the 4000 trip was his only gift. So now he got a trip and another present. My husband thinks I'm overreacting and said the mangas was $10 and he was in there saw it and thought about him which is why he got it. So in reality he got a 4010 dollar fight while out girls got a couple hundred bucks worth. Which is still a lot but not much compared to their brother. He understood that this trip meant no other gifts and my husband went against me. He doesn't see it that way and thinks I'm overreacting. He said every time he sees a book in there one of our kids may like he gets it for the. Any other time it would be fine. But this seems like he's showing favoritism.