Camping safari/self-drive Okavango/Kalahari in july 2011

Hey, we' re planning a trip to Botswana next july and are interested in camping safaris or similar. The ones we've found so far are more affordable with more people in the group. So anyone here planning to go around that time and would be interested in sharing costs etc. Self drive safari would be an option but would prefer a guided camping safari. Flexible about the route but planning on going in mid/late July. Hope to hear from you!