Not much time left but there is an Amazon Lightening Deal for Standard or Micro Three Broadband SIM, 1GB/30 days for £4.99 including delivery
www.amazon.co.uk/b/ref=BDW_UK_SWM?_encoding=UTF8&node=161428031&pf_rd_p=761806367&pf_rd_s=nav-sitewide-msg&pf_rd_t=4201&pf_rd_i=navbar-4201&pf_rd_m=A3P5ROKL5A1OLE&pf_rd_r=D3TFN8GA6ZJKBQTK354Q
www.amazon.co.uk/b/ref=BDW_UK_SWM?_encoding=UTF8&node=161428031&pf_rd_p=761806367&pf_rd_s=nav-sitewide-msg&pf_rd_t=4201&pf_rd_i=navbar-4201&pf_rd_m=A3P5ROKL5A1OLE&pf_rd_r=D3TFN8GA6ZJKBQTK354Q