I would think so too. I trust it's still £4, from all the usual stations? I hope so, it is far and away the best published railway timetable I've ever seen, if they doubled the price I'd still buy it!
I bought my copy for £4 from Exeter St Davids last week. I don't understand why, even though it's the best railway timetable available, FGW make it difficult to access? It's not available to buy online, over the phone, or at most FGW stations other than the main ones (Reading, Bristol TM, Oxford, Plymouth etc)
Stations are Paddington, Slough, Reading, Oxford, Newbury, Westbury, Swindon, Bath, Bristol TM / Parkway, Taunton, Exeter St Davids, Plymouth and Penzance I think, readily available at each.
What are these books ?