Certificate of Entitlement (COE) prices for Cat B cars have plunged 59 per cent at the close of the second bidding for December.

Prices finished at $2,656 - an all-time low for 2008 - and a big drop from the $6,501 recorded at the month's first bidding.

COE prices in other categories displayed moderate dips mostly.

Premiums for Cat A - for cars 1,600 cc and below, and taxis - dropped from the month's first bidding price of $7,721 to $6,200.

The Goods Vehicle and Buses category, Cat C, finished at $4,001 - a 23 per cent dip from $5,212.

Premiums for Cat E, the open category, closed at $6,509 from $7,589.

Cat D premiums for motorcycles dipped slightly from $1,102 to $1,059.