The last one you listed is one of the come-ons. Most of what you see (that you'd actually want) is actually from a pay service; the ones that
say they are for corel—you have to read the fine print. Many are in eps format—which won't work. The few that actualy are cdr and free... seem to be the exact same collection of ancient files available on many of the "free" sites.
TIF files are... not all created equal, but are not vector.
I'll take a look at the other links. We don't have a lot left in the budget to spend on reams of graphics for just a few images that may be useful.
Doc