The Acorn BBC Master, besides sporting a pretty cool name, was a lovely and rather powerful 8-bit micro, that was built as the successor to the popular BBC B micro, with which it was (mostly) compatible. The Master came with 128k RAM of RAM, a slightly faster processor and, well, you can discover everything there is to it by actually grabbing one.
This Acorn BBC Master auction should come in handy then. The computer comes in its original box and polys, is accompanied by a disk-drive and even has a selection of lovely games available for it. Among them you will find such classics as Elite, Frak Barbarian II, Repton Through Time, Qwak and Mr Wiz. Seller ships only to UK addresses, but asking for overseas shipments might actually work.