Sam's Club, the members-only branch of retail giant Wal-Mart, added two new Linux PCs to its lineup on Thursday. The machines, made by CPUBuilders, a division of Wichita, Kan.-based hardware maker Stratitec, are high-end models targeting cost-conscious small businesses and carry street price tags of $472 and $597. Each system is pre-installed with the "Linux for Everyone" operating system. The cheaper of the two runs on an AMD Athlon XP 2700 processor and includes an 80GB hard drive, a GeForce 4 MX440 64MB AGP video card, 256MB of DDR memory and a built-in 10/100 Ethernet modem. The $597 machine has an AMD Athlon XP 3000 and 512MB of DDR memory. The rest of the features are the same.