Since you are hunting for "raw chap 73," you likely want to know what to expect. Spoilers from the raw raws (pre-2chan releases) suggest:
If you are looking for the latest "raw" (untranslated) scans: Since you are hunting for "raw chap 73,"
Many publishers offer digital subscriptions or pay-per-chapter services where the original Japanese chapters are released simultaneously or shortly after print. Since you are hunting for "raw chap 73,"
Manga Republic: Useful for tracking physical volume releases and chapter availability. : Since you are hunting for "raw chap 73,"