Amazon's two-day Prime Big Deal Days sale wraps up today. Deals run until 11:59 p.m. Pacific time, or 2:59 a.m. Thursday on the East Coast, Amazon says. The sale is open only to Prime members.

Early numbers show shoppers kept their carts small on day one. Numerator, a research firm, surveyed 3,688 households and 183 verified buyers. It found the average household spent $86.98 on Tuesday, down 22% from $106.41 on the first day last year, Chain Store Age reported. The average order grew 5%, to $51.03. Two of every three items cost less than $20. The top sellers were everyday goods like protein shakes, toilet paper, disinfecting wipes and dish spray.

Forecasts for the full event are brighter. Adobe expects U.S. shoppers to spend $9.9 billion online across the two days, up 9.2% from last year, MediaPost reported. Adobe sees discounts peaking at about 19% off list price. The deepest cuts should be on electronics, toys, TVs, clothes and appliances. Furniture, computers and sporting goods should see smaller ones.

Amazon is not the only sale this week. Target Circle Deal Days run the same two days and require a free Target Circle membership, the USA TODAY Network reported. Walmart's weeklong Fall Deals sale needs no membership. More than half of the shoppers in Numerator's survey said they checked prices at other stores first, most often Walmart.

Amazon adds new limited-time deals three times a day, at midnight, 8 a.m. and 1 p.m. Pacific. A "Price History" link on product pages shows up to a year of past prices, which can help you spot a real bargain. Prime costs $14.99 a month or $139 a year, and some people qualify for a 30-day free trial.

Amazon calls the October sale the kickoff to holiday shopping. Adobe expects $95.8 billion in U.S. online spending this October, up 8% from a year ago.

What we know: The sale ends overnight, and day-one household spending fell in Numerator's survey.
What we don't: Whether total sales will reach Adobe's $9.9 billion forecast.