"BB King" wrote:

Do they have anything useable?

They sell a very short (ca. 8") AC extension cord that I find useful as a
way of plugging multiple 2-prong wall warts into AC mults; wish they made
a 3-prong equivalent, but the one they have is definitely useful.

Recently I found a $15 (!) digital audio format converter that converts
S/P-DIF coaxial to optical or vice versa. Though sold with a little wall
wart, it can be rigged to work from a 9 Volt battery for hours on end,
and it seems to work OK.

In a pinch I'll buy their alkaline batteries and they also have a rather
wide assortment of rechargeables, though with a little advance planning
one can surely find better prices through pro audio sources.