This item was posted here Two months ago at £320 and went pretty hot - Tesco have now dropped the price to £199 which seems excellent to me. They are also running an offer where you can get a 16Gb microSD card half price(down to £8.99) if purchased at the same time as the Dell Streak.
Be warned - it will work fine as a mobile phone but it's a huge device and will make your head look like it's been shrunk. The same huge screen makes browsing a pleasure though.
If you order it to be collected from a Tesco Store you can avoid all delivery charges.