I can personally recommend this, great cheap bluetooth headset. It's rechargeable, uses Nokia charger (AC-4 type fits N95 etc), and comes with one so your getting a charger with this too. It also has an ear loop. You have to adjust your phone's volume to adjust the volume on this.
My dad usually either looses them or breaks them, so better to get a few good cheap ones than expensive in his situation. With others he has tried he usually complains they don't fit properly or something but no complaint's so far on these.
it's not two in one box it's two separate with chargers. I say 2x because If you only get one it's £2 for delivery . I think this is a great price, it was 2 for £10 a long time ago but this is still a good price
There is also the BH-100 for £4:http://www.orangeaccessories.co.uk/bh-100_bluetooth_headset.html
so you can get the BH-102 and the BH-100 together for £10 delivered.
or get 3x BH-100 for £12
but I don't know anything about the BH-100