Quote Originally Posted by Боб Уайтман View Post
Why do you think it is a specific way?

"тысячью": to me it is just a wrong form. The instrumental "тысячей" can be transformed to "тысячею" (as a more archaic or poetic version), but in no way it can become "тысячью". It just sounds as if someone mixed declension types: ночь -> ночью, but туча -> тучей (or тучею).
Well, I'm glad people use "тысячей" anyway.

It's just that I saw this form in some intermediate books where it was mentioned on a side.

Also, I've just found this, where they talk about it in the lower section of the page:
http://www.gramota.ru/spravka/letters/?rub=rubric_92

That's why I kinda got confused with the inconsistency of it's use in some books - Aight - I'll stick to what you guys say then.

"тысячей" is the way to go.

Thx!