Online retail sales reached $1.8 billion for the week ended Jan. 15, compared with $1.36 billion in the corresponding week a year ago - an increase of 33 percent - writes Internet Retailer, citing comScore Networks figures. Online travel sales for the week reached $1 billion, up 14 percent from the $896 million last year. Online retail sales the previous week were up 35 percent from the year-ago period.