At Taos with a season pass, a 2.5hr group lesson is $40. Regular is $80 or buy 3 get 1 free for $240. Private 1/2 day is $475, full day $700, full week $1320. Or group week for $300. Specialty weeks are $400.
I have taken quite a few group lessons before and what I find to be somewhat an issue is when they ask you what level you are (without a ski off), most people will overestimate their levels based on the
color of runs they survive on.
Last year I took an advanced intermediate group lesson in CO. Everyone in the group said they usually ski blue and black, but when we started skiing, 1/2 the students were wedging their way down blue groomers. Surviving and skiing are 2 different things. It took an extra 45 mins to split the group to their appropriate levels and to get extra instructors to meet us, and this was a 2 hour lesson.
I think it is important to be honest about your abilities/skill level if you want to get the most out of the lesson.