I have purchased three guns, framing, finish, and a brad nailer. The Framing and brad nailers, (Porter Cable), I bought at Home Depot on sale, used, during customer apprieciation days. They were already discounted because they were used, then they were reduced again because of the sale. I could not afford to pass it up. (Well, that's what I told the Mrs.)
When I asked the sales staff about any warranty with the used, sale guns, I was told that Home Depot will always take it back.
Anyway, I bet that Lowes has the same kind of program.
I agree with Steve, cordless guns are great if you are working in the field but, if the compressor is going to be at your house, I think it's pretty safe.(you know your family better than me.)