Well, I did my senior first aid at the Monash Short Courses Centre in Clayton, Melbourne. I'm not sure though whether Monash has a short courses centre at any of its other university campuses... it cost me $170 for Level 1, level 2 and the CPR (all incorporated in the two days on the weekend, two Sats). You can also do it during the week if you like. Visit their website
http://www.shortcourses.monash.edu.au/vocational.html and scroll down because that's the page with the Senior First Aid details. Hope this helps!!! But I found that the St John Senior first aid seemed cheaper, I think $145? But if you need it quickly, I say just go for any senior first aid course thats closes, be it St John, Monash etc
Toodles!!