Don't think your going to find them much cheaper. Only thing is they're chrome plated brass. I would go with ss if I where you. Anything that thouches the beer should be ss only have to buy once. It's a little more expensive, but will save you in the long run.
The Perlick 525PC (chrome-plated brass) is much cheaper but there's the possibility the chrome will corrode and you'll get off flavors from the brass (though many people here seem to have had no issues with that over several years of use). If you're going with this model, you can get them for $18.50/per at ritebrew.com, which is a reputable seller: http://www.ritebrew.com/product-p/843162.htm