The following limits are placed on the sale of coupons on eBay:
Expired Coupons: The sale of recently expired coupons is not permitted on eBay, as such coupons serve no valid purpose and could be used in a fraudulent manner. Collectible coupons that clearly cannot be redeemed may be permitted.
Electronic "scanned" coupons: All coupons sold through eBay must be physically delivered to the buyer, and may not be delivered by electronic means for home printing. Further, to reduce the potential for coupon abuse, eBay asks that sellers refrain from placing clear, unaltered scans of coupons in their listings that could be copied, printed and redeemed in stores. The sale of scanned or photocopied coupons may violate federal copyright laws, and sellers of such unlawful items could face prosecution under federal law. eBay will not tolerate such transactions through its site.
Bulk coupon sales: Bulk coupon listings are defined as listings that contain more than 20 coupons for the same item, or more than 100 total coupons. If it is unclear how many coupons are offered, the listing will be considered in violation. Coupon inserts (packets of coupons typically found in newspapers) are limited to a maximum of 5 per listing, unless the seller indicates in the listing that the quantity of coupons for sale is under 100 total coupons.
Coupons for "free" products: Coupons for free products, with no purchase required, are limited to two per listing. Internet home printed coupons are also limited to 2 per listing.