You have several real options right now:
1. Here at OCUK, who sell a Tosh E1 at a very competitive price
2. A Microsoft HD-DVD drive, which will connect to either an Xbox360 (if you have one) or a PC via USB2. The HD-DVD drive is around £130. If you're considering connecting to a PC, you'll apparently need something pretty meaty.
3. Import one from the US. The problem with this is that they're now not that much cheaper than the UK, and as they will require a power adapter, probably incur import duty, won't be capable of playing R2 SD-DVDs and will be a pain in the bum to return to the vendor in the event of an issue, doesn't look like a clever option anymore.
4. Wait, there will always be cheaper options.
5. Go with a combined BD/HD player. Unfortunately the first one is yet to arrive and is likely to cost over a grand, so it's hardly a cheap option.