Vodafone are currently offering the Samsung Steel with 25% off every month which works out at just £15.00 per month.
Other offers include the USB Modem Stick Pro
£10 a month for first 3 months, then £15 (24 month plan) and also Dell netbook
£15 a month for the first 3-months, then £30 (24 month plan) with a free Dell Notebook.