[Imp]

Not bothered to download but you CAN NOT get enemy unit costs in battle only your own. Right clicking shows the unit info screen & the cost there is always the same, that for an experience 70 unit. The Germans will on average be a bit more expensive as there base morale is 75 the same as yours, later in the game it drops & they will become cheaper.
Experience effects cost you pay more for better experience & you can see this with your own units. First screen shows there statistics & second screen is the info screen identical to what you see for the enemy & shows the cost at experience 70.
So either you have been playing for a while & have high experience or you bought some expensive stuff OB artillery say at 250+ points which is roughly an Infantry Company. Only other possibility is you have the AI% ramped up in preferences.

I to am on my 3rd battle in the same campaign with AI at 125% & yes there are a heck of a lot of Germans. Its the tanks that are a worry last battle I destroyed 45 armoured vehicles which is 3 times my total armour. They got I am guessing about the same amount of infantry & more arty but I had more transport. A halftrack equates to a squad or 1/4 to 1/3 of a tank. A company of them & your starting to talk off board artillery prices.