Occasionally there is new stuff but the majority is used but in working condition.
There is no way to know what will be at the auction but it is definitely an all day affair and well worth the effort.
I bought an Eheim filter, aquariums, plants, books, cichlids, live food, light fixtures, driftwood, sponge filters and power filters last year.
Eheim Pimpette #270
Eheim Pro II 2028; Classics Series -2215, 2217, 2260, 2262; Pro 2229 Wet/Dry