I grew up with a glass bottled, metal-capped siphon of "Jewish champagne" in my grandparents' fridge. I still seek out "water with a kick," as my nephew used to call it, whenever I can. Most travels abroad I'm just happy I can get my water with bubbles in a regular water bottle, but in Buenos Aires I discovered in many cafeterias (a term they seem to use for cafes that also serve food) one could order "soda" and get a personal-sized plastic siphon of soda water (seltzer) all to one's self! (More on that later)
These classic siphons were for sale at the Sunday fair/flea market at Plaza Durrango in the San Telemo district. Prices were about $30 to $150 each, depending on the rarity and condition of the bottle.
Buenos Aires Tourist Tip: This Sunday market was one of the largest and best street flea markets I've ever been do. Do plan on being in Buenos Aires over a Sunday so you can take it in, bring lots of pesos (although some dealers will take dollars) and leave lots of time. The fair is huge.