Sorry Tony but you are wrong. Theres currently 4 on the website which are always on the shelves. Plus the 2 you named, plus a lime lager which I bought yesterday and there was a red lager which i cant remember the name. Thats 8 beers. Tiny Rebel is a staple of Sainsburys beer section.
Clwb Tropica, Cali Pale and, stock permitting, Mango Shakedown are the only ones in North Hylton Road. Electric Boogaloo was in briefly but not seen it for months. They had an 8 pack of mixed ones in a few weeks ago, but that hasn't been seen again. Never seen any others in there and I'm in once a week at least.
They may, briefly, have had Easy Livin, but not sure, and if they did it was last year.
I am partial to Clwb Tropica mind, nice sessionable fridge filler.