(Salem, OR) -- Oregonians who need an extra tax credit can buy them during the College Opportunity Grant Tax Credit Auction. It's held from December 5th through December 9th. The money raised from the auction goes toward the College Opportunity Grant program. The Legislature approved up to 14-million dollars in tax credits to be sold each year. The minimum bid is 450 dollars. Each certificate is worth 500 dollars. The Oregon Department of Revenue has more details on its website.