Historical Board Gaming has everything you need. In the event you want a lot more pieces of all types (say if you don’t want to use chips anymore), you can buy Axis and Allies 1942 to cannibalise the pieces (assuming you’re playing Global 1940, and this works vice versa).
Trying to complete Counter Offensive set
-
I need,
#9 Sherman IVC
#20 Guards T34/76
#21 KV2 Model 1940
#30 Elite Stug III
#32 Nashorn
#37 38M Toldito trade I have,
#2 Churchill 3
#7 Cromwell 4
#12 Corsair
#13 LVTA-1
#17 85MM AA gun
#22 Polish SU-85
#33 Panzer 3 commander
#38 40/43 howitzer
#42 Type 4 ho-ro
#43 type 88 75 mm AA gunplus the UC and C units