There were a ton of them available on amazon and ebay two days ago. I purchased a refurbish one for around $4k. If you can rely on the seller on either site, they are available. I contacted each seller with many questions and got one in two days, as I just got mine after work today.
Congratulations - you will be able to see why we all rate them now

Here is the workaround to get the equiv on M mode + ec + auto iso
Objective: Set set a minimum and maximum shutter speed. In Av mode if the shutter speed dropped below the mimimum then the ISO would be bumped up so that the minimum was reached again.
Method:
- enable safety shift (iso speed) C.Fn 1 - 8
- set shutter speed range C.fn 1 - 12 ( set the minimum shutter speed )
- set the Av value
- set the base iso value (can be L so then it acts as auto iso)
- set exp comp as needed (yes we get exp comp and auto iso this way)
So there you are - how to get auto iso with iso and Av limits set.