Re: metal grills for cabs and heads?
Ebay.
The good heavy gauge stuff is very expensive, Like, I mean, very VERY expensive for a perfoated sheet . Not sure if it comes powder coated.
The cheaper gauge stuff is much less costly.For low watt combos, the cheap gauge stuff can work.
That said, for speaker grills in general , the heavy gauge stuff is optimal.
I forgot where to get the good heavy gauge stuff, I think on ebay, and 'Zoro Tools' IIRC.