I have one of the ST Dupont 'replicas' and absolutely love it. Various online retailers were offering them for free with purchase of a box of [NC] RyJ 1875s or La Gloria Cubanas. I believe the deal has stopped and the lighter has become hard to find but the deal surely will come around again as this was not the first time it was offered.
However, they also pop up on eBay from time to time. They retail for around $200 or so normally, which doesn't make sense to me if they can offer it for free with box purchase but who am I to complain haha. They also come with a limited lifetime warranty under the condition that you ship them the lighter and $5 and they will send you a replacement. They typically go for $50-$100 secondary market.
I know this is not as helpful as it is not readily available as the other suggested lighters but these really do compare to the S.T. Dupont lighters and many "lighter freaks" reviewed them and deemed them a great lighter. I am no lighter expert but like I stated before I really do like this lighter and have not had any problems with it thus far.
Here is the link to it on the Altadis website:
http://altadisusa.com/cigar-accessories/miscellaneous/romeo_y_julieta_lighter
Edit: It appears that Corona Cigar has the deal up again and back in stock for the LGC lighters.
http://www.coronacigar.com/products/la-gloria-cubana-serie-n.html
Also, if you decide to order from them, be sure to add the free 5pack (I believe it is still valid with this offer):
http://www.coronacigar.com/products/free-item-of-the-week.html