Yes, Bill at abcfab is excellent.
I also am a fan of abcfab (on eBay.) One of the few sources of single sided board stock, multiple thicknesses, multiple weights of copper, multiple materials, multiple colors, accurate descriptions, fair shipping and good prices overall. If only his pictures matched the descriptions more often (size wise)!
His international shipping is excellent too, but for some reason he doesn't list his items as international....so you have to go .com to find them :-/
Oh well, just call me a non-believer. I just never buy into the snake oil stuff about how audio guys can hear the difference in the type of PCB material used or the warm sound of really expensive capacitors, gold placed AC input cords versus just the normal stuff...
Anyway... I only stay away from FR2 cuz I hate how fragile it is.
The way I see it, not every property of a component is included on the data sheet.
Oh well, just call me a non-believer. I just never buy into the snake oil stuff about how audio guys can hear the difference in the type of PCB material used or the warm sound of really expensive capacitors, gold placed AC input cords versus just the normal stuff...
Its all totally suspect, you give a 'golden ears' a double-blind trial of various equipment and they can't tell the difference - people love to self-delude! Oxygen-free copper speaker cables for instance, double-blind trials and they can't tell the difference from bell-wire (neither can electrons for that matter)
All due respect, your totally wrong 
Here is a good video illustrating the difference in Tone produced from a range of same valued caps
that is a pretty good demo with the different caps, thanks for the link