Not much in the store has set prices, so the volunteer at the front has to decide if the offer made for items are reasonable.
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I strongly urge the shop manager(s) to get together a committee to decide on
EACH and EVERY gift to that shop. This is not a "make an offer" type of world,
and since this money is desperately needed, a fair price should be charged.
Should you be able to get someone who is familiar with GoodWill or Salvation Army's currant prices, that one would be a big help.
But just glancing at an object and guessing a price is not business like and should immediately stopped.
Since I am an active shopper in thrift stores and have gotten bragging finds,
just tell me where you are located. Sure hope it is near me!!