Home Depot carries a product called peak railings, it's not technically a fencing product but it looks similar to what you have in the pictures; It sells for around $70 per 6ft panel if memory serves. (The pickets look like straight tubular steel in the pic, if they're twisted wrought iron ignore the above)
Unless your looking for a small length ~ 20ft or so ~ it's actually more cost effective to have a shop custom make the railings for you than buying from a big box. I haven't personally worked with any metal fence or railing companies though, so I can't recommend anyone.
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