theres an auction site where they have daily and weekly bids that repeat quite frequently. there is historical list of bid prices that already shows lows/highs/avg winning bid. users then are able to choose whetehr to bid up to avg price or a percentage of the avg price or plus/minus a certain amount of dollars/cents from avg price.
users will be able to create a list of items they want to bid on.
similar to ebay sniping the software will bid at the last possibly moment to avoid driving prices higher.