Make a hot oil hair treatment at home rather than buying the expensive commercial version.
1/2 cup olive oil
1/2 cup boiling water
Place olive oil and boiling water into a large glass bottle or jar with lid (a glass baby bottle with a stopper works well) Be careful, as jar will become hot – you may want to wrap it with a towel. Shake very well until you can see the oil is distributed evenly throughout the water.
Massage into hair when just barely cool enough to use. Put a shower cap over your hair (the ones you get in hotel rooms work great – you can also use a plastic grocery bag) then wrap with a damp hot towel. Allow hot oil to work your hair for half an hour, then shampoo and condition as usual.