USPS via eBay offers the USPS Classics Forever Souvenir 6-Stamp Sheet for $3.30. Coupon code "PERFECT3" cuts the price to 30 cents. With $1.30 for shipping, that's $3 off list and is the lowest price we could find. These stamps are new versions of six stamps first issued in the mid-19th century, and are printed using the intaglio printing method, as were the originals.