Hi hi,
These Sennheiser headphones are great for jogging or running! Sweatproof and all that jazz, they've recently been replaced by the PMX 685i which retail for about $100.
Just picked up a pair of these headphones for $40 from Dick Smith in Malvern after doing the store pick up. This is the fourth pair I have bought (as gifts) and they have never been below $50.
I saw these today in the Perth CBD store. There was 1 of the OMX680 and about 3 of the PMX680 left. I have checked store stock around Australia and stock levels seem to be OK.