People pining for the sleek PlayStation 3 gaming console might find shortages on eBay as well. The online marketplace is imposing restrictions on the PS3, which is expected to become one of the hottest holiday gifts when it hits stores Friday. Only established eBay vendors–those who have racked up comments from at least 50 previous customers and have positive ratings of at least 98 out of 100 points–can list PS3s before Friday. Each vendor can only list only one PS3 per eBay account. The listing must include a photo of the pre-order receipt, and the seller must guarantee shipment within 30 days from the date of purchase. Before Friday, PS3s can be listed on eBay only in auction formats–not as “buy it now” items.