See if you can get a MS IME 3.0, it's almost the exact same shape as the DA and should be quite a bit cheaper.
You could also try finding an old DA or DA Black used or on sale.
Of the ones you've listed only the M500 is really close to the DA, the G300 and Abyssus are ambitextrous and, at least the Abyssus, quite a bit smaller. The G300 might be similar size, I haven't tried it, but I wouldn't be surprised if it was smaller than the DA.
edit:
you could also click the link in my sig and see if any of the info there is any help