The Pentax K30 is currently at €570 with the 18-55mm kit lens, and it includes a basic automatic bracketing mode, which will take three shots with different exposure. It also has an automatic in-camera HDR mode (also with three images), and a multi-exposure mode which automatically overlays the 3 with a simple blend.

You can choose how many stops to vary the exposure by, and what order (underexposed first, then regular, then overexposed, or another way) you want them in. And it'll take all three exposures with one click.

However, if you want more shots than 3, or if you want to vary something other than exposure (or choose which exposure parameter is varied), I don't think you'll be able to get it without spending more. (The almost-twice-as-pricey Pentax K-5II has many more options.)

Depending on your needs, you might be best served by a non-dSLR camera — specifically, a Canon point-and-shoot model running the CHDK firmware hack, which could give you very powerful programmatic control over bracketing. (Models change all the time, of course; if you come back to this question a year from now, make sure to see what's latest.)

Or, you can, of course, simply bracket manually.