Spider Mites

Spider Mites

Does anyone know of a cheap, safe, and effective way to get rid of spider mites? I recently bought a mini rose bush, and now I'm finding red spider mites all over my windowsill. I also have a couple spider plants in the area, but I haven't noticed the mite problem with those... are the mites plant-specific? I'm not opposed to chemical treatments IF they are safe... both for the roses and for my cat, in case he decides to nibble on the roses (he's left them alone so far, but you never know). But a cheap, natural remedy would be perfect. Please be as specific as possible... I know next to nothing about plants, so this is all new to me. Thanks!
what are these bugs?!

what are these bugs?!

Magic Carpet Spirea

Magic Carpet Spirea

some of my bounty!

some of my bounty!

Whazzat?

Whazzat?

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Tulips are just in time for Easter

Tulips are just in time for Easter