Try buying separate tickets. I've bought a return to Cambridge and another ticket to Needham Market. I think it was £25 in total.
Pink Panther is the train ticket guru though.
This was the route I used for Leiston to avoid the replacement bus service. Was only £12.30 from my local station to Cambridge including cross London transfer by Tube with Network Card discount. Don't anyone reckon on buying their ticket for the second leg at Cambridge though, I made that mistake for last season's trip to Bury and only just made the connection with seconds to spare - there's a 14 minute connection, but Cambridge station ticket office is mayhem on a Saturday morning, I'd advise anyone to buy their ticket for the second leg online in advance, or I believe you can book it at King's Cross on the day.
Just out of interest what fares are people paying? Obviously going, come what may, but don't seem to be able to find a fare for less than £45 return from ED (£30 if three or more people).
I booked for £9 each way Stratford to Needham Market (changing at Colchester and Ipswich) a few weeks back. This was cheaper than going from Liverpool St (which is more fiddly for me to get to in the first place) and you can get to Stratford from Overground stations for £1.50 each way with an Oystercard
as long as you swipe on the pink reader at Canada Water or Whitechapel. Just checked and you can still get £9 for the return leg leaving NM @ 1850, but cheapest outward tickets are now £17.50 from Stratford. Bizarrely you can get £16.80 outward from Liverpool St, but returning to Liverpool St the cheapest is also £16.80 on the 1750 service out of NM.
If you have a Network Card Manningtree is the last station on the Ipswich line within the Network Card Zone. Cheapest walk up far on the route is to book a day return to Manningtree from your local station with Netwoek Card discount, then a separate day return from Manningtree to Needham Market. (You don't need to actually break the journey, you can book this ticket online or should be able to book it from a ticket office at a local station and have it with you before you board the Ipswich train. Only criterion is that the train must call at Manningtree, which I believe all trains connecting with NM services at Ipswich do.)
Otherwise go via Sankara's route, which I did for the Leiston trip.