TRAVEL - Here are some tips for getting the best deal on on-line travel sites. First go to the sites with firm prices likewww.bestfares.com, www.travelocity.com, and www.expedia.com to help you set your bidding limit. Be prepared: after you win the auction is when you make your reservation so your travel dates must be flexible. If you can't travel when the dates are available, it won't matter that your price was best. Travel auction sites are:www.luxurylink.com and www.skyauction.com.