That is absolutely LUDICROUS pricing, absolutely. Gears and install kits will total less than $500 for both axles. Maybe 200 more if you want carriers for both axles. There's around 7 hours of labor total for both axles at the very most to install them. $1400-1600 is typical with $1600 being on the high side including all parts and all labor for both axles. Total.
I literally just received a complete set of the very best quality gears and install kits you can buy two days ago, they're from Revolution Gear manufactured by Circle K. You cannot buy better quality. That kit retails for $475.92 at
https://revolutiongear.com/product/jeep-tj-rubicon-d44d44-koyo/
My first regearing job including all parts & labor was just a shade under $1300. My last regearing job for all parts & labor was just under $1100 because I knew more about what it should cost and I knew what was involved so I pushed back harder for an acceptable discounted price.
$2200 to 2500 is a price a shop would quote if they're out to gouge/screw someone who doesn't know what it should cost. The only way they should be quoting that pricing is if that price also included full carrier lockers or Truetrac LSDs for both axles.
These are all the parts required, ring & pinion gears plus master install kits for both of my axles. $474.92 total. Some will need carriers too but those can be found less than $100 each.
But if you go with 'thick' ring gears as I did, you won't need carriers like the carrier split guides will indicate.