J.d., I assure you your info was interesting and useful
As a side note, I popped into my local bookshop this morning (not a huge shop, but better than Smiths) and there was NO Moorcock in the SF section. In fact I noticed that all the books were pretty thick and most of Moorcock's early stuff was thin, though at the time they were considered normal - around 180 pp. Maybe shorter books are simply not stocked these days except in specialist bookshops, because it's harder to justify the exhorbitant prices for a 180-page book. That doesn't explain why there were no omnibus editions though.
eBay to the rescue, I hope...