Space Discovery Stampers Saver Cards were issued by the United States Postal Service (USPS) on October 1, 1998, in Kennedy Space Center, Florida. The five-card collection was sold exclusively at participating USPS Post Offices. The card series was designed by Phil Jordan.

Each card pack includes a Space Discovery title card. The card features an uncredited photograph of Bruce McCandless II on Space Shuttle Challenger STS 41-B. Mission Specialists Bruce McCandless II and Robert L. Stewart performed the first untethered EVA on February 7, 1984. The astronauts tested the nitrogen propulsion thrusters of the Manned Maneuvering Unit (MMU). McCandless is pictured travelling at nearly 18,000 miles per hour, but the relative thrusts of the MMU were roughly two or three miles per hour.