If you were on the CL Cup scheme, I'd wouldn't write off hope of getting one of 3,500 completely (if these rumours are true), based on the fact it will be expensive to get there now and a high number of tickets will cost more than a Season Ticket at City. You'll just need deep pockets, but can't imagine upper price categories (eg €600) moving very quickly. It will still take some going to take that many, at such expense, at such short notice. It will go lower than most expect.
Hopefully Spike and the Club travel partner put on reasonable options. I've got a vague memory of around £300 day trips but doesnt factor in inflation and there may be an add-on due to lack of alternatives/convenience. Interesting to see.