I keep finding myself coming back around to the space elevator. In the Galactic Clicker game the Space Elevator technology is a boundary tech, when you buy it, you transition from a planetary level to a solar system level. I guess it makes sense that it is going to be seriously hard to do major work in space when everything that comes up is taking literal tons of fuel to get into orbit.
There are plenty of works dealing with space elevators, and plenty of artwork too. It is interesting, daunting, and I'm not sure how it would fit into the mythos of the Cosmic Era. There are still rockets and mass drivers, so getting into orbit is cheaper, and with A-pods and launching from an aerostat is easier than launching from the ground.
I do keep coming back around to something I wrote earlier, the tether-vator. Rather than a true space elevator, the tether-vator is a space escalator, lifting goods and people from the surface to a floating aerostat complex. The complex is tethered to the ground, and very likely a superstructure like an industrial acroplex. Goods are zipped up the tether to the aerostat. There is a second tether, this one connected to a space station in a locked orbit, where it stays in the same place relative to the ground. It's tether is connected to the aerostat, and the 'stat sends it's goods and passengers up the space tether to the station. Once in orbit, the hard part is over, and small craft and other ships can move the goods from the station to wherever they need to go.
In a few decades or centuries a network of tethers would eventually grow, and a Niven Ring could start to form around the planet. Goods go up the now true aerostat-less elevators to the ring, where a transit system moves the good to another node in the ring, where they are either loaded onto a ship, ferried to a mass driver, or go down another elevator to a different point on the planet.
This is all well down the road and would very likely be the transition from the Cosmic Era to something like a Stellar Era, or Universal Era.
Does it fit the guidelines of the Cosmic era?
Is it for sale? - yes. Using the tether-vator is a for profit operation. You don't buy the system, you lease a spot on it, or you buy a ticket. Also, with the size and function of the system, it is easy to attach antenna for broadcasting, or a cable for secure data and hardline communications, all of which come at a premium cost.
Life is cheap? - probably quite a few people died during it's construction, and there are certainly accidents, but they do not stop the operation of the system
Sex is everything? - phallic image?
Frantic Pace? - the tether-vator doesn't stop. There is always a steady flow of goods and passengers going back and forth. Cue the Futurama and Jetson's pneumatic transit tubes
Antique Values? - not sure about this one
Nothing is Real? - the tether-vator looks like a solid thing, but it is a number of flexible components. It looks solid, but it can move, it can move a lot. It's all dangling bits hanging from things, it's a rope hanging from the gym roof.
Everything is terrible - The tether-vator is an eyesore, it is horrible to ride on, like a swaying roller coaster that constantly feels like it's about to go off the tracks, if there is a problem, you could suffocate before help arrives. EM radiation from the magnets driving it, the disturbing socio-economic power of the Tethervator operating corp or govt agency