I worked at halfords, so i know the score with those shockwave bikes.
They will arrive in store, and will be displayed at a stupidly high price for a few weeks (the minimum time allowed before they are reduced legally), and then they will get a 50% price reduction.
They are still far to expensive for what they are even at half price. In saying that, in the few years i worked at halfords there was one or two exceptions where the shockwave bikes where actually decent bikes for the money (note i say for the money - not decent bikes).
The bike we sold the most of was the apollo xc 26 (the most basic model, not the s or the se).
Most of the guys in our shop told people that unless they where prepared to spend £300+ then spending any more than the £70-£80 on the xc 26 was a waste of money.
Its bikes like the shockwave that gives halfords such a bad name. Its technically not possible to get some of the brakes to work, you can make them work better, but they will always grind, and all of the gears will never work.