If you mean lightweight, portable studio lights, tbat would be different from dedicated flash units. Most still life and portraiture can be done with your camera's brand flash units, using at least two for best results. You need to get your main flash off the camera by means of an extending arm and a extension flash cable. A lumiquest reflector or a softbox attachment will help. The second flash can be slaved and used on a spare tripod. In any case, a good flash meter will help in setting up the lighting ratio.
If you mean studio lights, there are many brands out there, some quite reasonable. If your budget can't go for the least expensive new, then try the used market. Roberts Photo in Indianapolis is a good source of equipment. Even though theer are two lights and stands in kits, you'll still need to invest in a good flashmeter.