Blaze and the Monater machine toys recommendations?

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Both my boys (5&2) are obsessed with this but there doesn't seem to be great selection of toys for it or am I missing something?

Does anyone have a toy that they would recommend?

My DS likes the Blaze that turns into a plane, and the slam and go range

*monster - oops!

The die cast cars are great, i recommend hunting down a full set and letting them make their own adventures
the slam and go versions are great for little ones.
the bath toy is useless!

Bath toy is crap. Dd loved these last year and they only hit the shops late December. She got slam and go blaze and a few of the die casts thats it. There was no great selection

Argos do the die cast characters for £5.

Busy book- with playmat and 13 small figures. £5 in Morrisons or tkmaxx.

This is it