In the building trade these are known as resilient channels and one of their main uses is for sound attenuation. One such product is US Gypsum's RC-1. It is a .5" x 2.5" x 25 ga. galvanized channel. They are a good product but I don't think that you will save much money especially considering that you will need to buy or rent a screw gun and cut-off saw to install them. They cannot be used with nails. Your ceiling will be just as flat using the 1x4's.
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