I wonder the same - why pre 1982 - do they press better?
Post 1982 pennies are copper plated zinc and the silvery zinc can bleed through.
Pre 1982 are a copper alloy that is the same color throughout the coin.
Where are you buying the books to put the pressed pennies in? Are they available at WDW?
yep, you can get them at just about any and every gift shop at the resorts and in the parks. generally check by the check out counters. they were $7 or so dollars the last time i bought one (at least a year or two ago though.)