Biltmore ticket prices are tiered based on season, day of the week, time etc.
The Christmas tour is the most expensive of the perennial seasonal tours. The Candlelight tour that OP has tickets for is kicked up a couple more notches in price because it is on a weekend and at night. I think a wine tasting is included but not certain.
The tours are done with a pre recorded audio device that guides you through at your own pace. Each major room has someone stationed to answer questions. There are options for group tours with a guide but those are reserved for certain day/times and kick up the price quite a bit.
I went August 2024 on a Friday afternoon. My only previous time was nearly 35 years prior. The ticket was right at $100. Monday-Thursday are a little less. Winter after New Years start at $70 I think. There are no free tour options for adults, but discounts/free for children pending age.
I get what Pineheel is saying, but if you’ve never been or it’s been a long time it is worth it to do at least the standard non holiday weekday tour, IMO. Took me back a little when they told me $100, but when you consider what it costs to attend a UNC football/basketball game these days not so much at all really. There is a lot to see. And you don’t have to be concerned with leaving disappointed wondering WTH you just witnessed either {rimshot}.
There is a UNC alumni discount, but it is pending certain day/time and tour type. I just remember it was not available the day I went.