Share costs on 3/4 day safari departing Sept 20?

My girlfriend and I are looking for a 3 day safari to end our Kenya trip, somewhere other than the Mara (will have already been there).

We're on a budget (USD300-400 each) and would rather skimp on accommodation in return for a decent vehicle and guide to take us on early morning (6:30) + evening game drives. We have our own 2-man tent.

We'd love to find another two people to make a custom camping package through Lets Go or Gametrackers affordable (or other reputable company).

Alternatively... recommendations on how to achieve our goals within budget, and without self-drive, would be much appreciated.

Cheers