Some options:
- The cheapest way to find drum loops is definitely to do a search on Google. There are TONS of web sites that offer them for free.
- Buy a drum loops sample cd.
- You could also use a plug-in like
Spectrasonics Stylus RMX that includes a large variety of drum loops in various styles. It's basically a very large sample library bundled in a plug-in that lets you play them at any BPM, lets you re-arrange them in any way you like and so on...
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The Free Sounds Project is another nice option. Loads of various samples, including drum loops that you can use under the Creative Commons license.