Post 402161 (https://www.thevespiary.org/talk/index.php?topic=11837.msg40216100#msg40216100)
(Rhodium: "Nitrous Oxide from Urea, Nitric and Sulfuric Acid", Novel Discourse)
taking a up 'electric/arc welding' as a hobby or have nitrous fitted to your car... legal in EU surprisingly enough
using chemicals.. may as well go back to the 19th centuary
(but it does work if you dont mind experimenting with your lungs)
Its a dangerous thing to da but u can also use ammoniumnitrat
to make N2O by heating on low flame an beeing careful about the ignitionpoint