2 Disney Blu-Ray for £13.50, 2 Disney DVD for £10.80, 2 Disney 3D Blu-Ray £16.20 prices are delivered price using code SIGNUP10 @ zoom.co.uk. TopCashback also available at 4.44% at the moment.

NOTE: One thing I should point out about zoom.co.uk is that although they show the films with the cardboard slipcases from my own experience they tend to arrive without them so if you are desperate for the slipcases I would advise buying from one of the other companies even though they are slightly dearer.

Link for Blu-Ray:
https://www.zoom.co.uk/category/special_offers/disney_2_blu_rays_for_15

Link for DVD:
https://www.zoom.co.uk/category/special_offers/disney_2_dvds_for_12

Link for 3D Blu-Ray:
https://www.zoom.co.uk/category/special_offers/disney_2_for_18_3d_blu_ray

Unlike Amazon there is free delivery for everyone at zoom although it also has to be said they don't have the same extensive range of Disney Blu-Ray's and DVD's on offer but still seems to be the cheapest around for them.

However the following retailers are also offering the following Disney Multi-Buy Offers (will update post when other retailers offers are live as thought it made more sense to have them all in one post rather than separate posts for each):

Amazon - link for main page for offers as follows:
https://www.amazon.co.uk/b/ref=amb_link_1?ie=UTF8&emi=A3P5ROKL5A1OLE&node=11454363031&pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=qpe-title-tag&pf_rd_r=3P8BCBX79DDE8A715HCH&pf_rd_r=3P8BCBX79DDE8A715HCH&pf_rd_t=201&pf_rd_p=27348707-3da5-49d2-b075-d6e18a7f8bd0&pf_rd_p=27348707-3da5-49d2-b075-d6e18a7f8bd0&pf_rd_i=B01J9WL21K

2 DVD for £11.99
2 Blu-Ray for £14.99
2 3D Blu-Ray for £17.99
NOTE: Delivery only free for Prime Members or orders over £20 for Non-Prime.

Zavvi (free delivery) - Cashback available from both Quidco (4% for DVD Sales for 6 days, 2.5% for entertainment sales) and Topcashback (2.5% for DVD and Blu-Ray sales)
Link for Offer Page:
https://www.zavvi.com/offers/disney/multibuy/bluray.list?widget_id=385782
2 DVD for £12
2 Blu-Ray for £15
2 3D Blu-Ray for £18

HMV (free delivery) - Cashback available from both Quidco (2.5%) and Topcashback (2.77% I think)
Link for Offer Page:
http://store.hmv.com/film-tv/disney-2-for-12-dvds,-2-for-15-blu-ray-2-for
2 DVD for £12
2 Blu-Ray for £15
2 3D Blu-Ray for £18

Tesco (very limited selection on their website but more available in store):
2 DVD for £12
2 Blu-Ray for £15

Sainsbury's - I can't find any info at the moment on their offer but would assume it would be the same as Tesco, Zavvi and HMV seeing as it seems to be standard pricing....Amazon are slightly different at a whole 1p cheaper and zoom is the cheapest due to the discount code.