If someone needed a quick inexpensive stainless steel condenser, the local hardware vendor sells stainless steel gas applance connector tubes. They are flexible and resemble ribbed condoms, just like the inside of many glass condensers. They come in various diameters and lengths.
Those who have messed with copper condensers may already have encountered this, but swim suggests, before using one, clean and scrub the hell out of it, before use, even if it looks shiny and new. Swim has wound up with discolored solvents more than once as a result of copper tubing that looked nice and shiny clean, but wasn't.