sorry to burst your bubble but those arent very good swords. the made in china mark and the price should tell you that. any steel used to make any sort of blade reguardless if they are purly decorational or not can be sharpened. however how long and through what kind of use they will hold that edge makes a huge difference. i have a hand made folding knife that my dad bought me that i use for hunting though i plan on replacing it with a fixed blade by next hunting season for rust reasons as its hard to get blood out of the mechinism out in the feild and blood and steel do not mix. its blade is made out of a circular saw blade. even with my pathetic attemps at sharpening it will keep its edge through field dressing two deer and the rough butchering one which is fairly impressive. my buddy has a blade that he used to field dress and slice a whole deer into lil strips for jerky. that impressed the hell out of me.
as to swords, you will almost never pick up a decent one for under $10 and if you do you robbing some one blind cause they dont know what they have. the work that goes into true Japanese katanas is unreal. but there is absolutly no way to mas produce them. they must each be made by hand. medevil type swords arent nearly as involved but it still takes time and effort to make them. and you never use stainless steel for a true sword, its to tough to work and generally is pretty poor at keeping an edge. heck most custome gunsmiths dont care to work on guns made of stainless cause its a pain.