According to their web site, www.skitaos.org,
Taos Ski Valley runs Ski Weeks every week of the winter. They are comprised of either five or six mornings of instruction. The website also says there are special "Masters" ski weeks (age 50 and up) starting 1/13/02 and 2/24/02, and womens ski weeks starting 1/16/02 and 2/3/02. The cost of these is $375 or $450 for five or six days respectively.
They also run a few Super Ski Weeks which are 5 1/2 day of lessons. These are being run starting 1/6/02, 1/20/02, and 2/3/02. The cost is $692.
These prices are significantly less than any comparable week-long lessons I have seen. Note that, according to the website, these prices include lift tickets.
The ski school at Taos has a very good reputation. I attended a Super Ski week last year, and thought it was quite good. This year I am probably going to attend the one starting 2/20/02. I've got to make that decision in a few days.
Lodging at the slopes is fairly expensive, while lodging in Taos seems reasonable, but it's a 30 to 45 minute drive to the slopes. Infomation is available thru their website.
If you're from a city served by Southwest Airlines, they seem to have good fares into Albuquerque. Their website is www.southwest.com.