As I understand it, the Rhino Kit only comes in two packs, the Vegas Rocker kit, which costs 2269 w/o Premium and contains the clothing pack TAS20 Shotgun and vehicle kit:
Or you can buy it in the Vegas Rocker Bundle w/ Vegas Rhino 4x4, which costs 4436 w/o premium and contains the 4x4, the clothing pack, the vehicle kit, as well as the Tas20 Shotgun:
Both of these seem fair prices to me.
However, if its EXTREME value you are looking for, you might consider the Vegas Uber Bundle. Which while not containing the Rhino pack, and has the 2WD rather than the 4x4 Vegas, as well as 3 body kits, all for only 2495