Inforcomm Tech and Multimedia Integrated @ Funan IT Mall got better pricing on Adobe products, you can try to check there. Other shops "there" got higher pricing. Do walk a few other shops to check their price.
Else, u can download 30-days trial @ Adobe's website to try.
The way to learn is to try to use it, there's no shortcuts, except get an expert to show you some quick tricks.
What exactly do you mean by 'reasonable'? I'm sure Adobe will say their list price is 'reasonable'.
If you're on a budget, consider GIMP, a well-featured open source alternative. I think there are some issues with CMYK, but most photographers work in RGB anyway. I've been using it for the last month, and it's really good (esp for the price!)