United supporters were charged just £20 in the original Upton Park fixture, which the Hammers led 2-1 until Robin van Persie rescued the Red Devils with a late equalizer on Saturday.
Supporters of the East London club will also have to face up to an expensive trip from London to Manchester next Wednesday evening, and it is believed that there will now be a far lower turnout at Old Trafford than the 10,000 initially predicted, The Daily Mail reports.
Under new FA rules the home club sets the price of the tickets whereas in the past the figure had to be agreed upon by both participating teams.
In the case of a third-round tie, the minimum price set by the FA is £15.
However, although United are required to offer only 15 percent of available seats to West Ham fans, match proceeds are split equally between the two clubs with both receiving 42.5 per cent.
The FA takes a 5 per cent cut while the remaining 10 per cent goes to the pool which is used for the competition’s prize fund.
The Hammers will be hoping for a repeat of the 1-0 victory they secured at the home of the Red Devils in 2000-01, where Paolo Di Canio netted the winner to send the hosts crashing out of the competition in the fourth round.