GarageSalesTracker.com offers advice on how to price specific items for a sale. According to their online guide, worn clothing should command between $1 and $3 and unworn clothing with the tags attached should be priced at 70 percent of the retail price. Ask $1 for used books, CDs and DVDs. Home electronics and household appliances range between $5 for heavily used and outdated items to $25 for newer models. View the entire pricing guide here: http://www.garagesalestracker.com/garage-sales-guide-pricing.asp.
Sometimes it is best not to put a price tag on yard sale items and allow the people coming to buy your items a chance to name their own price. Some people may be willing to spend more on an item than what the price says, with no price on them, you will be able to get more money.
Usually you can charge half the price for new and not used items. Evrything else would be about 25% of the original price, other things which are still usable but are worn out could cost much cheaper than 25%.