I used Beckett magazine for several years to look at prices but realized that they are made up numbers when the magazine was printed. If player A came up and had a great first month his card prices would skyrocket. Then it would take months for his cards would come down in price if he started playing terrible or was injured. Also I was never going to sell my personal collection so I never really cared about the prices.
I used to look at the Beckett Annual but the printing was so small that I couldn't read it. Then came along TCDB and that is all I use for my checklists.