TransformersattheMoon poster 'Rich' has supplied details HERE that details a list of items avaialble from the 20th May in the Argos and Argos Extra Catalogues in the UK.  Click the link to read the original or the actual details are coppied as follows.

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387/0828 TR MV2 Assortment
£28.99. (Superion - the only thing so far in stock)
387/2204 TRA MV2 Scout Assortment, £7.99.
387/2307 TRA MV2 Assortment, £12.99.
387/2383 TRA MV2 Voyager, £22.99.
387/2668 TRA MV2 Mega Power Bots, £37.99.
387/2974 TRA MV2 Bumblebee, £39.99.
387/5500 TRA MV2 Bumblebee, £99.99.
387/5627 TRA MV2 Legends Pack, £12.99.
387/5658 TRA MV2 Powerbots, £22.99.
081/4777 TRA MV2 Human Alliance, £29.99
081/4856 TRA MV2 Robot Weapons, £39.99.
081/4980 TRA MV2 Supreme Combiner, £99.99.
081/4997 TRA MV2 Battle Chargers, £12.99.
081/8955 Transformers Megatron £44.99.

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Note items starting with 081 are Argos extra items and have to be specially ordered from a normal Argos or can be bought normally in larger Argos Extra stores that carry the full product line.