A working listing kit at the low end looks roughly like this. A prosumer camera drone in the $1,000 to $2,000 range. Two spare batteries at $100 to $200 each, because one battery is about 20 to 25 minutes of flight and a listing shoot burns more than that. A pair of fast memory cards. A set of ND filters, $60 to $100, which are the darkened glass that lets you keep a slow shutter in bright sun so motion looks smooth instead of stuttery. A hard case. Call it $1,500 to $2,500 to be genuinely job-ready with spares.
Recurring: the $175 test fee once, per-aircraft registration, editing software at roughly $20 to $60 a month, cloud storage for delivery and archive, and drone liability insurance either annually or by the hour.
The expense people skip is the second aircraft. A listing shoot is usually scheduled around a seller who cleared out for the morning, and a gimbal that stops responding in the driveway means you either deliver nothing or you reschedule someone who's already annoyed. Plenty of operators run an older drone as the backup rather than buying two current ones.
One more thing worth setting before your first paid job: your turnaround promise. Agents work against listing-launch dates, and "next day" versus "three days" changes how you price and how many jobs you can stack in a week. Say it out loud in the quote so nobody invents their own deadline for you.