As complete machines? That'll be tough, but if you want to build your own, Alternate (at least the Dutch branch) offers a Chieftec 1U enclosure (UNC-110S-W) for 179 Euro's (about 120-ish GBP). Mind you, it's full ATX so 53 cm deep. Spec's: 300W PSU present, 2 harddisks, 1 floppy and one optical station.
(yeah, it's Dutch too
several 1U cases ranging from just below 100 upto 400 Euro's of various brands (including fornamed Chieftec, at 125 Euro's but in black). Problem is not so much their willingness to ship overseas, but dealing with them in Dutch. I've done business with these chaps once, quite ok. Got me a new Shuttle XPC PSU from them
Contact: info(at)pcmegastore.nl or fax: +31 1 64 21 13 89