I found the basic dolls in my local Asda today (mane 6 minus Rainbow Dash and Fluttershy) for £12.97. These are avaliable on Asda's website too,along with the articulated Rainbow Dash (no photos of Fluttershy but I guess she will be avaliable soon) but if you're looking to buy it from Asda - don't! It's £50
buy it at Argos for a much cheaper £29.99