How do you expect to treat patients then?
Anyways, couldn't agree more with what Vene said. My Littmann is the best $120 I ever spent, it's probably one of the best tools I have. Granted, I can hear lung sounds well enough with the crappy stethoscopes provided by my company, but they kill my ears, and quite honestly, they gross me out.
I could never take a provider seriously if I saw them with the kind of stethoscope described above. It's unprofessional, an it only serves to make you look like a hack to your patient, and to fellow healthcare staff. It's not horribly difficult to keep track of your stethoscopes, granted there are times when things get hectic and it may get misplaced temporarily, but that seems rather rare. Buy a decent scope, get your name engraved on it, and take care of your things so you can take care of others.