Any cobrahead with a wattage less than 100 watts, must be HPS and pretty cheap too. Mainly asking because I could not find any, on eBay.

Ironically there are a few cobraheads around here that have 50 and 70 and 100W HPS where residents have requested the lower wattage due to glare into their backyards or side of houses.  Sometimes they will use deflectors but sometimes not.  Those that have been swapped out for LED generally get the lower wattage LEDs as well. 

I may well be wrong, but seeing as @Maxim is selling some stuff, he may have something for cheap + postage.