COG:
It might take a couple of weeks to get the LCD-2s and -3s from Cable Co, those cans are in high demand -- in fact somebody was waiting for the -3s when I had them. I think I waited no more than a couple of weeks. My guess is shipping for just 2 headphones will be in the $25 range or less if you are in the eastern half of the country, maybe a bit more in the west (remember, you are paying round trip, as they provide a return label). If you are even considering any other cans that they have in the library, you might as well borrow them too: the marginal cost is almost nothing, since the cheapest thing you are considering buying is nearly $1K, meaning you could theoretically borrow $20K worth of hardware and all it costs you is shipping. They'll throw in extra cables too, some for free, some not, unless you tell them specifically not to. Again, the real marginal cost is almost nothing for the cables (they don't weigh much, so the extra shipping cost is negligible), but you need to decide if you want them included.
I am REALLY interested in somebody trying the Mjolnir with the Audeze's, and you owe us a review in exchange for all of our "free" advice.
. If I were you I would try to time the headphone delivery with the arrival of the amp. Reading around here, it appears that you will get your amp in the next couple of weeks, so no big deal if you have to wait a week or two for the loaner Audezes.
And Audeze doesn't allow discounting, so the only way you would get them cheaper is used.