I just went to the Argos Extra store in Nottingham city centre to see what TFs were available. I checked out the deluxes and Voyagers first, and only came up with Skywarp (who I have), Unicron and Nemesis Breaker - neither of whom I'm sure whether I want, but I didn't feel like shelling out full price for them today, anyway. So I went up a stage, and asked to view the Ultras they had in stock. They said there were 18 Ultras, but didn't know what they were till they came down. Three Manasors turned up - so it looks like he's the only one they had at that price point. And they're reduced to £16.99 at the moment - cheaper than the Voyagers! I almost felt like buying one, just out of kindness... but I didn't.
So to summarise - if you're in the Nottingham area, the Argos Extra near the Vic centre has 18 Menasors at £17 a throw!