The T-34 was a very weak tank, a literal "propaganda machine" that drove itself only by the shear power of the gun and the skill of the crew.
You know the T-34 was also considered trash when the Japanese Imperial army could easily destroy them with Molotovs thanks to the poor welding and assembly..
Production costs and man-hours went down during the war. In 1941 8.000 man hours were needed to produce one T-34, this was reduced to 3.700 in 1943. Price in rubles went from 430.000 in 1940 to 168.000 in 1944.
Note that the manhours figure for the T-34 probably refers only to the construction of the hull and turret, not a finished tank.
Regarding the price, the study ‘Engineering analysis of the Russian T34/85 tank’, p5 says that:
‘it is believed, that the cost at the time of manufacture, converted to USA currency, would exceed 50.000 dollars.’
This was the same price as the M4 Sherman, an overall better vehicle, so it is not clear of how the T-34 was ‘cheaper’ than the competition.
It’s also estimated that the T-34 would cost around $45,000 to $50,000 for each tank built, but is this production price really cheap? When compared to the Sherman that costed $45,000 to build and the Panzer IV with a production cost of $45,500, the T-34 seems to lose its cheap label.
T-34 losses were massive, especially to the end of the war, when the Russian Army just wanted to rush to Berlin. In 1944 the Russians had built 13,950 T-34’s and lost 13,800 of them, in 1945 in just 4 months of war they managed to lose about 7,500 out of the 12,110 built in that same year.
So, the Russian Army didn't overwhelm the German lines with T-34’s, but with a wide variety of Armored Fighting Vehicles (AFV) together with the sheer number of troops. At the end of the war out of the remaining T-34’s, it’s estimated that only half of them were in operational condition and even then, they represented less than 50% of the total number of tanks available.
How many of these tanks went down before Russians broke through the German lines? More than 80% were lost in total.
Know the truth before saying and trusting stuff from propaganda.