3972 yen in the Karuizawa 72 Golf

How about weekdays from April 1 to 15th, playing golf at the Karuizawa 72 Golf west course? It says that the web special open price is 3,972 yen, not including your lunch and tax. This price is very cheap and I haven't seen it for past years. The normal rate for this period is 6,500 yen. Also, weekends on April 2nd and 3rd have two patterns,one is the normal 12,300 yen price, the other is the 7,245 yen web special price. Because this round rate is very affordable, it will be fully sold out by March.A slightly early booking is necessary. The price 3,972 yen is for 4some(4 players) 3-some ＋1,080 yen/2-some ＋3,240 yen
 http://princegolfresort.jp/rsv_sys/prince/karu72-west/calendar/index/start:201604