I went to quite a lot of aways in 1999/2000, it was a great season, personally speaking I was only about 16 then and it was a lot cheaper for me to do it no responsibilities. We had great support at most places that year, Forest and Barnsley stick in the memory. We had 6,000 at the latter which was a game not long after Walsall.
I seem to remember a few local(ish) games that season, Tranmere, Port Vale, Stockport, Huddersfield, Sheff Utd, Barnsley plus WBA, Brum & Wolves and of course Blackburn most of which had cheap tickets and large allocations though not all as I think the Midlands ones were night games. That year as well were chasing the Promised Land again for the first time since 1996.
Of course it's right that a lot this season did sell out but for any that took a while, it's just very dear these days compared to back then, perhaps some are more selective and tv scheduling affects it too. Even the year after 2000/1 most tickets were I think about £20-£25 although that could've been to do with my age. These days to take in most Premiership grounds you're talking £40, quite a few are in London and you can be talking £100-£150 for the day.