From Jo'burg on SAA:
SA 303 Depart JNB at 06:00, Oct 23 Arrive CPT at 08:10, Oct 23
SA 372 Depart CPT at 19:50, Oct 25 Arrive JNB at 21:50, Oct 25

Air Tickets: R900.00
Air Taxes: R833.00

Info accurate  info on 3 July. Thanks to Mark for providing this.

Update
Mark's flight was shifted later on Sunday evening, so watch out for that.

From Bloemfontein:
If anyone is coming down from Vereniging via Bloemfontein, Ernest and Hennie are driving down and would like to share petrol. Please email info@imacsa.org and we'll pass your message.

If anybody else is coming from out of town, please let us know how you're getting here and we'll put the information up.

Kulula special (on their site):
Flight: kulula air(MN)
From: Johannesburg (JNB)
To: Cape Town (CPT)
Departs: 23-Oct-09

Flight: kulula air(MN)
From: Cape Town (CPT)
To: Johannesburg (JNB)
Departs: 25-Oct-09

Resort: Cape Town, South Africa

Accommodation: Protea Hotel Cape Castle - 3 Star
Description: This deal includes your return flight (and all taxes), your car and your bed (and your meal too if you selected that option).
Board Basis: Room only
Room Type: Standard
Check-in: 23-Oct-09
Check-out: 25-Oct-09
Duration: 2 nights

Supplier: Kulula

Price From: R1956.00 per adult sharing

Also there's a sale starting September 1 at 6am tomorrow and ending at midnight

tickets from locations such as PE - R299 (includes all taxes)
tickets from JHB or durban - R399 (incl all taxes)