D.L.
we used a company called Little Bird Babyproofing to do our gate across the top of our stairs. he found one that matched our wrought iron - ordered and installed it for around $130. that was about 3 years ago but I have referred him to several people since then to do baby gates as well. he also does complete babyproofing in your house - toilet seats, cabinets, etc. well worth the investment :)
Little Bird Babyproofing
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Brad Lemmon