full duplex soundcard

$36.95 7.1 Channel PCIe Sound Card Full-Duplex 8CH DAC/2CH ADC/ Playback And Recording	$21.95 7.1 Channel PCI Sound Card Full-Duplex Playback/Recording/ 8CH DAC/2CH ADC
$29.89 Startech.com PCISOUND4CH-PCI 4.1 16BIT AUDIO FULL DUPLEX - Kit	$34.40 Startech.com PCISOUND5CH-PCI 5.1 24BIT AUDIO FULL DUPLEX - Kit