Who do I tell that a value is wrong for an item?

ItsDeductible is in a state of flux. It is being redone and is not complete yet. Expect it to change substantially before the IRS and Turbotax will accept 2016 tax returns or filing. The values in ItsDeductible are adjusted several times per year and then when you import the data into your Turbotax return, the most current values are used.

"Quality sweaters are worth more"  Keep in mind that the values are generally what the items would sell for at a Thrift or Charity shop, which is likely to be much less than you would expect.

Yes, but Goodwill has raised their prices so much over the past couple of years.  I donated two bicycles and It's Deductible say bicycles are worth $12.  They were priced $75 the next day at the Goodwill where I donated them.   Clothing has increased also.  People that have to shop at Goodwill, can't afford to shop there anymore.

Goodwill and other thrift stores are not ignorant of the value of items that have a higher retail value and price things accordingly. I was surprised when entering pairs of wool & wool blend dress slacks that khakis/chinos were allowed a higher value in ItsDeductible, even though Goodwill would certainly price dress slacks or slacks with brand names like Ralph Lauren, etc. at a higher price than Dockers.

If you have an item for which you think the valuation in Its Deductible is too low or an item that's not listed in ID, you can go to ebay and check the price (sold listings) of identical items.  You may use those values (put them in as "add it" items).  If I was donating a sweater that has sold for $21 on ebay, in the "item" blank on the add it function, I would put "sweater ebay value."  I have used Its Deductible for years and this has never been questioned.  ID uses ebay as one of its "standards" of valuation.