Challenger-tour matches have the price softness everyone discusses but the actual information gap is real — there's no broadcast, ATP doesn't promote, news is essentially absent for early rounds. Where does the forum get its information?
Twitter accounts of player coaches and tour journalists. Eurosport's Tennis Channel sometimes covers SF/F. Tennis.com forum boards. And for stats — Tennis Abstract by Jeff Sackmann is the single best public resource for player-level analytics.