Rock Band: Band In A Box (Instruments Edition) on all formats is currently £34.99 in-store in Smyths. Picked one up for the XBox 360 today (from Friern Barent) and it contains the guitar, drums and microphone (no game), sales rep looked a bit shocked.
Still £69.99 on their website though, so must be an in-store only offer. From the poster in-store looks like it should be all stores as well.
Now does anyone know the best place to get the game??