If booked right now on Expedia, for Mid-Jul 09: $2200 - $2400 per person for airfare. I think you can beat that deal with a company that books these flights regularly.
Transport of capes and skulls back to the US is about $250.00 per animal.
It looks like the Outfitter has several consessions to hunt and the package could dictate where you can hunt and what is avaialable in the area. But, here is the rundown of what I looked at:
Blesbuck $400
Common Duiker $300
Impala $300 - $500 (horn length)
Common Reedbuck $800
Warthog $300 - $600 (tusk length)
Zebra $1200
Blue Wildebeest $900.00
So, you can spend as much as you can scrape up between now and then.
Additional days will add the daily rates for those days. $350 / day (I think)