Quotation was obtained from Ramesys, actually based in Nottingham. The costings aren't too bad for the software but again like most Microsoft Server type of products it is the CAL User/Device licence that costs. Our costings were about £105 SCE 2010 with SQL, SCE 2010 Management Licence £12.50 per device managing SCE, Client Management Licence slightly over £2 (works like CALs). The price may be different as these are specific to our school.
We are also looking at Configuration Manager 2007 this is more for distribution of software, OS deployment and packaging and is more than SCE2010 pricing not 100% sure of. The CAL licence I think was about £6 per device with the Configuration Manager being under £300.
Hope this helps with the how much?