Groupon UK - If you are UK based this emusic deal is worth reading
Not sure how many here can access Groupon UK, but they have a deal for emusic available today and tomorrow (15 and 16 June UK time). Basically you get 25 tracks per month for 6 months at an overall cost of £18. I think that works out at 12p per track. Needless to say I have ordered 4 packs, which is far cheaper than boosters. See http://www.groupon.co.uk/deals/national-deal/emusic/452840 for details