The cheap ETR 105mm isn't the macro. Checking KEH right now the macro 105mm starts at over $300. That's most of the budget. Still need to add a camera body,back and finder. Plus shipping. Still no metering.
Does the older 100mm macro make 1:1 without tubes?
Uh, Nick, I said 105/4.5. And $300 from $700 leaves a bit for body, finder, and back.