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Other than SQ Labs which isn't inexpensive...
ergo tech make a 12° bar at a reasonable price. they are not light and have no idea how they feel. available from the german sites.
https://www.bike-discount.de/en/syntace-vector-7075-high-20-120-780-mm-31-8
Syntace do a (rather more spendy) carbon one too.
Hmm, the Bikemonger has Salsa Rustler.
I've used the Salsa bar for a few years on the main bike and it's been great.
I’d second the Salsa Rustler bar in 800m. Got one on the singlespeed and it’s very good indeed, very comfortable. Half considering upgrading it to the carbon version and moving the alloy on to another bike.
Stooge Moto? Think it’s 16deg tho.
I have a lightly used Sq lab one somewhere that I could be persuaded to part with.....
I have Ergotec bars on two bikes, they're not light but I need the extra backsweep more than I need to save a few grams! Mine were about £40 from Rose before they stopped selling to the UK (about £10 of that was postage).
I'm not sure of anything, I've struggled a bit when looking for 15 deg bar before
This is cheap if you could handle 10 degrees:
https://ritcheylogic.com/bike/handlebars/comp-trail-rizer-10d-handlebar
https://www.bike-discount.de/en/ergotec-riser-bar-50-31.8mm-handlebars
These are the ones I have, they're not very helpfully named. They do loads of different bars but these are the DH certified ones. They're also available in higher and lower rises.
I've Stooge Moto bars on my burly hardtail and singlespeed. They're very good for comfort (great wrist/arm position and have a nice bit of flex), out the saddle leverage and steep descents.