If you only notice a few spider mites then you can just spray them off with a strong blast of water, Pat Stamile said he did this as well as bringing in beneficials that go after spider mites. You would want to repeat the water blast regularly.
You can also use Horticultural Oil to smother them but you need to makes sure you get under the foliage real good.
Bayer has a product out 3-in-1 insect, disease, and mite control that is supposed to be for spider mites (never tried it) that may be good for smaller gardens. If I remember reading the label correctly the chemical in it for spider mites is only a contact miticide.
There are other products out that have not shown resistance buildup and there is one that is actually a systemic and not just a translaminar (goes from top to bottom of leaf), but they are extremely expensive right now.
