Just booked mine and Punchy's for the Southend game in January for only £16-50p each each way. It's still up for £16-50 each way (railcard price) on Arriva Crosscountry's site and app if you get in quickly for the (0540 off Plymouth and 1032 off Fenchurch street arriving Southend Central 1126) or the (0657 off Plymouth and 1113 off Liverpool Street arriving Southend 1211) and returning on the (1803 from Southend and 2003 from Paddington)
If your unable to find these prices then try a few different train companies sites as GWR site quoted considerably more for these even though they were up at this price on national rail site.