21 Lessons for the 21st Century | Price history
Price change log
03/06/2022: $11.78
03/03/2022: $11.1
12/16/2021: $10.49
12/15/2021: $11.07
11/30/2021: $10.49
11/29/2021: $10.87
11/12/2021: $10.79
10/26/2021: $10.49
10/25/2021: $10.79
10/23/2021: $10.99
10/22/2021: $11.06
10/19/2021: $11.5
10/16/2021: $12
08/06/2021: $12.99
08/04/2021: $13.29
08/01/2021: $13.49
07/30/2021: $13.79
07/26/2021: $13.99
07/23/2021: $14.3
07/22/2021: $14.39
07/20/2021: $14.5
07/17/2021: $14.89
10/06/2020: $14.99
08/31/2020: $12.29
08/29/2020: $14.84
06/21/2020: $12.29
06/12/2020: $13.49
06/06/2020: $13.4
06/05/2020: $12.59
05/22/2020: $13.99
05/21/2020: $12.63
05/20/2020: $13.95
05/19/2020: $12.6
05/15/2020: $15.74
04/27/2020: $15.99
04/05/2020: $16.2
04/04/2020: $15.64
03/14/2020: $16.2
10/05/2019: $14.49
10/04/2019: $14.99
10/03/2019: $14.49
10/02/2019: $14.99
10/01/2019: $14.92
09/27/2019: $14.49
09/26/2019: $14.92
09/15/2019: $14.49
08/30/2019: $14.4
08/29/2019: $14.37
08/26/2019: $13.69
08/22/2019: $13.04
06/26/2019: $12.78
06/08/2019: $16.2
06/02/2019: $15.4
05/30/2019: $16.52
04/27/2019: $15.4
04/22/2019: $16.89
04/10/2019: $18.14
03/24/2019: $22