Spain
2000 wood for 10 hackapells /
1000 wood for 13 halberdier with guard upgrade
Britain
2000 coins for 26 skirmishers, guard upgrade /
1000 food for 8 highlanders
France (same research, different levels)
500 food for 4 veteran grenadiers, but available in colonial /
1000 food for 8 grenadiers, upgrade also remainings to guard (namely middle guard) /
2000 food for 15 grenadiers, HP & attack +10%
Germany
2000 coins for 12 dopplesoldners, HP +10%
3000 coins and all mercenaries are free now
Netherlands
2000 coins for 30 musketeers, guard upgrade /
1000 coins for 5 stradiots
Ottoman
1500 foods for 3 great bombards /
1000 woods for 15 janissaries
Portugal
2000 woods for 11 black riders /
2000 woods for 22 veteran crossbow PLUS HP & attack +30% !
Russia
2000 coins for 17 hussars with guard upgrades /
1000 wood for 9 dragoons with guard upgrades
Say, queue some mortars and leave 20+ pop slots, borrow some coins from allies, call 2 or 3 mercenary forces simultaneously, then the 2 church forces... enemy's full pop slot military can't defend (don't need imperial)