eBay seller “dailyappliance2010″ has some generally great pricing and availability on stainless steel fittings. For example the pictured 1/2” stainless hex nipple is selling for just 99 cents with free shipping. There is a caveat in that these ship directly from Asia. That means it may take a while to receive your order.
Check it out – Here – This search is for “1/2”, one of the most common sizes that we as homebrewers use. Note that it isn’t a perfect search as other sizes will show up. Other sizes are available, just search for what you need.
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