There is a older t-rex that goes cheap but the new 2005 t-rex the frame retails 250 quid new. and if you go for the full bike its 499.99 for the lower spec model and 699.99 for the better model..Not alot of difference in the 2 so i would go for the power spec as my m8 did and they are a sweet bike to ride. There is a t-rex frame for sale on here 2005 model for 180 quid.