StampStore is an online marketplace that allows APS members to sell philatelic material worldwide. All items come with a 30-day money-back guarantee and ship within one business day! To celebrate Halloween and the end of National Stamp Collecting month, APS is running a special offer, active from October 29 through October 31. Take advantage of this opportunity and get $5 off of any purchase over $75 using the coupon code TREATS. This one time coupon code is available to both members and non-members.