Cooling down from −78 °C to −88 °C without cryogenics

Say I have a gas cylinder with nitrous oxide and cool it down to −78 °C with dry ice. Is there an endothermic process/reaction that would extract the remaining heat from $$\ce{N2O}$$ and bring it down by 10 °C to its boiling point of −88 °C? I know this could be done by using cryogenics like liquid nitrogen, but I want to avoid those.

• you could let out a little bit of the gas the pressure drops and it cools down Mar 28 at 1:30
• At -78C the N2O vapor pressure is only 1.8 bar - do you think it would be enough just to let that out? Mar 28 at 1:40
• a dry ice/ether cooling bath will get you below -90C Mar 28 at 6:15
• When dealing with pressurised gases, it is usually better to let the gas flow into a cold place rather than cooling the cylinder. Not least because the gas will still have enough pressure to get out of the cylinder. Mar 29 at 14:23