Yah see that doesn't include the actual transmitter/controller or goggles though says they are "optional" and optional like $1K I'm guessing, try adding that in and see. The quad itself is around $200 so that seems right, the transmitter is usually around $100-200 ballpark
I'm a big fan of my Jumper T16 but there are some good competitors out there with TX16S and T18 from different companies but have wide compatibility with FrSky or FlySky or Spektrum receivers, if going for longer range can swap out the actual radio/antenna part in the module bay of any of these transmitters but as is could pick one of those OpenTX based ones up and get any cheap frsky or flysky or spektrum receiver and get things bound together.
One transmitter can be used across many many models (planes quads etc.) the limitation here is can your transmitter connect to and send control signals to your given receiver, in many cases you can just replace the receiver if the one that comes on a device doesn't work but these OpenTX radios with 4 in 1 or 5 in 1 modules give you a large breadth of options.
Regarding compatibility of Video gear, there are effectively two options right now, analog which is everyone except DJI and digital which currently is just DJI (FatShark has some digital options in the works but still in development basically). For anything under a 5" you'll probably still be using analog video transmission etc. because the digital stuff is heavier and makes more heat/draws more power so wouldn't want it on something tiny. Basically if you plan to ever fly 2" or 3" quads (highly recommend) then analog is still the way to go. One pair of analog goggles can connect to any number of quads they are really a little radio receiver/decoder (called goggle RX modules) and a display of some sort that fits on your face. On digital it is a little bit more of a two way communication thing and so "tuning in" to someone elses digital feed isn't as easy as with analog.
With regard to some sort of all in one kits I would suggest taking a look at:
Amazon.com: EMAX Tinyhawk RTF Micro Indoor Racing Drone with FPV Goggles and Controller for Beginners: Toys & Games
www.amazon.com
The goggles are from what I hear not terrible and fairly cheap kit, plus get a little quad that is a lot of fun by itself with it. The only bad I've heard is the controller/transmitter you get with the kit is kinda garbage, but for a beginner or anyone newish to this hobby dealing with binding and receiver protocols is the biggest pain point.
I had a lot of fun times with my crappy eachine box goggles that were like $50 but eventually you'll start getting out of range for the receiver/antenna setup on those cheaper goggles and want diversity (dual antenna which looks like box ones above have) and possibly better displays or just something nicer.
store.dji.com
