How much did a warhorse cost in the Middle Ages?
The record: £80, about 1290.
About $230,000 in today's gold
38 years of a farm labourer's pay.
The elite 5 % of warhorses; an average appraised warhorse of the 1340s was nearer £10–£16, and William de Bohun lost one valued at £100 in 1339. Source
Who could buy it
The lowest paid on each ladder of 1350 whose pay was enough:
In other words, out of a farm labourer's reach: more than a whole year of his pay.