Recently-graded PSA baseball cards from the 1970s. When comparing these prices to ebay, please take into consideration the shipping and tax you would pay with ebay ($100 card will usually cost you about $113 with shipping and tax).
1972 Topps:
#38 Carl Yastrzemski in Action - PSA 6 - $20
1973 Topps:
#1 All Time Home Run Leaders (Babe Ruth, Hank Aaron) - PSA 4 - $50
#50 Roberto Clemente - PSA 7 - $165
#130 Pete Rose - PSA 7 - $110
#142 Thurman Munson - PSA 6 - $40
#193 Carlton Fisk - PSA 7 - $75
#220 Nolan Ryan - PSA 6 - $80
#230 Joe Morgan - PSA 8 - $130
#245 Carl Yastrzemski - PSA 7 - $90
#245 Carl Yastrzemski - PSA 4 - $25
#255 Reggie Jackson - PSA 7 - $65
#257 - Yogi Berra (Orange Variation) - PSA 6 - $20
#300 - Steve Carlton - PSA 7 - $45
#305 - Willie Mays - PSA 8 - $375
#320 - Lou Brock - PSA 7 - $45
#330 - Rod Carew - PSA 6 - $30
#400 - Gaylord Perry - PSA 6 - $25
#556 - New York Yankees Team - PSA 7 - $25
#609 - Dave (Davey) Lopes - PSA 7 - $45
#613 - Bob Boone - PSA 7 - $45
1975 Topps Mini:
#228 George Brett - PSA 6 - $185
1975 Topps:
#146 San Diego Padres Team - PSA 8 - $40
#201 1963 MVPs: Sandy Koufax and Elston Howard - PSA 8 - $40
#611 New York Yankees Team - PSA 8 - $40
1976 Topps:
#1 Hank Aaron Record Breaker - PSA 8 - $115
#10 Lou Brock - PSA 7 - $40
#19 George Brett - PSA 6 - $50
#150 - Steve Garvey - PSA 8 - $45
#160 - Dave Winfield - PSA 9 - $250
#240 - Pete Rose - PSA 8 - $275
#270 - Willie Stargell - PSA 8 - $55
#300 - Johnny Bench - PSA 7 - $75
#330 - Nolan Ryan - PSA 8 - $275
#340 - Jim Rice - PSA 6 - $35
#341 - Lou Gehrig All-Time All Star - PSA 8 - $50
#342 - Rogers Hornsby All-Time All Star - PSA 8 - $50
#343 - Pie Traynor All-Time All Star - PSA 6 - $20
#344 - Honus Wagner All-Time All Star - PSA 9 - $110
#400 - Rod Carew - PSA 9 - $300
#420 - Joe Morgan - PSA 7 - $35
#480 - Mike Schmidt - PSA 7 - $50
#500 - Reggie Jackson - PSA 6 - $30
#525 - Billy Williams - PSA 8 - $50
#530 - Don Sutton - PSA 8 - $35
#550 - Hank Aaron - PSA 8 - $325
#585 - Joe Torre - PSA 7 - $35
#592 - Willie Randolph - PSA 9 - $95
#600 - Tom Seaver - PSA 9 - $200
#650 - Thurman Munson - PSA 8 - $75
1977 Topps:
#1 Batting Leaders: George Brett - PSA 6 - $30
#2 Home Run Leaders: Mike Schmidt - PSA 7 - $35
#6 Strikeout Leaders: Nolan Ryan - PSA 6 - $25
#10 Reggie Jackson - PSA 9 - $350
#60 Jim Rice - PSA 7 - $25
#231 George Brett Record Breaker - PSA 9 - $80
#234 Nolan Ryan Record Breaker - PSA 9 - $160
#265 Mark Fidrych - PSA 8 - $120
#285 Brooks Robinson - PSA 7 - $40
#355 Lou Brock - PSA 7 - $40
#473 Andre Dawson - PSA 7 - $60
#547 Willie McCovey - PSA 9 - $100
#650 Nolan Ryan - PSA 7 - $95