Willing to take 721s that are working (last checked 1 and a half year ago I think)?
Most likely, if the price is right.
What's the magic number? Also where about are you located?
I would say, less the $100 per miner. This is assuming that it is only the miner and it's auc cable. I always look for broken units because someone might have one that is just sitting. I have the capacity to repair most miners I have worked on, unless the glue the heatsinks to the ASICs.
I am located just north of Charlotte NC USA. Could send a shipping label to you.
I can do less than $100 per miner. I did some checking and we have a LOT of working 741s if you're interested - for the same price as the 721s. I can send you controllers as well. you can easily run 20 cubes per controller. I suggest 15 cubes max or around there though.
So total # of 741s is 168 lol