Akai MPX8 Mobile SD Card Sample Player
Sure, the MPX8 is a MIDI pad controller with 8 Akai pads. But with an SD card slot for your samples and 21 on-board sounds, it's a standalone instrument too.
Roland SP-404A Linear Wave Sampler
Record and tweak samples on Roland's portable beat-making machine -- no computer necessary. Built-in mics and mic/line inputs let you capture any source.