Jim,
To the best of my knowledge, Monel is not a brand of staples. It is a trademark for a company that makes special alloys. Having Monel and stainless steel on a package is actually a contridiction if referring to the true nature of Monel. However, Monel is rustproof. The brand is Arrow for either stainless or Monel. Check out this link for the Monel:
http://m.lowes.com/mt/www.lowes.com:80/pd_242243-412-505M1_0__?catalogId=10051&productId=1068805&UserSearch=MOnel&Ntt=MOnel&N=0&langId=-1&storeId=10151&rpp=12&un_jtt_redirect
And here for stainless:
http://m.lowes.com/mt/www.lowes.com:80/pd_242245-412-506SS1_0__?catalogId=10051&productId=1068807&UserSearch=Arrow+stainless&Ntt=Arrow+stainless&N=0&langId=-1&storeId=10151&rpp=12&un_jtt_redirect
Please note on the packages that Monel is "good for marine applications", but the stainless steel is "not recommended for marine applications". Odd... I know. But that's what they sell.
All the best,
Glenn