I am not sure about duds guy.
You are bound to have a few hydro stores down in the valley.
I called around talked to several of the places around here, One guy gave me a price competitive with anything I found online, so I went for it. It was a "Can"
I am not sorry one bit after getting mine, a bunch of peace of mind for under $100. Besides, those guys know if you buy something that doesn't work, you are likely to go to their competitor.
I haven't seen many of them with brands on them, so I am guessing a bunch of them are from the same few sources and just have a "manufacturer" logo sticker plastered on them or have branded boxes they slip the wholesalers blank box into.
The more I have shopped them (the hydro stores), the more I realize a bunch of these guys are all getting their products from one or two wholesalers, so i don't mind leaning on the local guys for better prices. Just like getting a little action, if you don't ask, the answer is always "no".