Yes Ed, that's really too bad. Several months ago ESS was unloading their remaining stock of new large Heil transformers (tweeters) on ebay for $300/pair (I think?), so I am not surprised they are now gone. Thought about buying a pair just to have them for an emergency.

By dust covers do you mean the surrounds around the woofer cones and the passive radiators, or do you mean the whole grill-cloth "bonnet" that sits on top?