I had trouble finding them at motor factors. I purchased them from Car & Headlight Bulbs | H1, H4, H7 | Phoenix Autobulbs
I agree, their life expectancy is shorter than standard H7 bulbs, but remember they are just re-bodied H9 bulbs, so not in the realms of the 'higher risk' 80/100W types.
Data from various decent sources shows:
Normal H7 55W, 1500 lumens, 500-hours
'Long Life' H7 55W, 1400 lumens, 600-hours (I suspect these are OEM fit)
'Extreme Power / Night Breaker' H7 55W, 1500-1600 lumens, 200-hours
Osram H7 65W, 2100 lumens, 250-hours (same as a H9)
The increased brightness from the so-called '+110%' bulbs like night breaker and extreme power results from using a smaller, harder driven filament. This causes their short lifespan.
For me, the 65W bulbs are a good trade off for brightness vs. lifespan.