Have you checked out the Sage website for their training packages ?
It all comes down to what you want, either through a provider such as Idealschools or the diy method. Weigh up the pros and cons of each in terms of what knowledge you already have, the costs of either option and whether you want or need study support.
Ive not used Idealschools myself so cannot comment on whether they offer good value for money. Just find out from them exactly what you are going to get for your money !