What's the best way to get rid of these all at once vs eBay?
You have to define what you mean with "best" and for whom

.
I reached out to some wholesalers and they think I was born yesterday, offering me less than 50% of what they are selling on eBay for.
Those guys love to keep huge profit margins ...
If a Company wants to get rid of a lot of stuff quickly, then they sell it for a given price to a Hardware Liquidator who will make 100-500% Profit on them.
If you prefer to handle 200 Individual Orders, Testing, Packaging, Shipping, potential Customers sending Messages/Orders etc for the Price difference go for it.
As a Private Person or owner of a small Business that's probably what I would do.
From a Business Standpoint, would 500 Times the cost Difference (plus the fact that you or somebody else wouldn't work on your normal Work) make up for all the Time invested ?
The good thing is that you have a single Type high value Article.
At the same Time selling Stuff is time consuming. I'm trying to sell some private Stuff to clear up some Space but between taking Pictures, setting up Listing, following up, etc, all for 95% of the Things to never get sold (it's rare that I get reasonable Offers), then it wouldn't be something that I look forward to.
Everybody thinks their and other People's Time is free. It's not.