Have just sent the kids (dairy-allergic 8yo and non-allergic 4yo) on Easter hunt round the garden for little chicks which they then exchanged for a small box of Lego each, and they are soooo happy!
I've tried loads of different types of dairy free choc over the years but DS1 valiantly tries to like them and then loses interest the next day - all came to a head last year when DS2 seemed to get chocolate from lots of different sources. DS1 was really upset and we decided the toy option would suit him better - still offered DS2 the choice of chocolate but he went for brotherly solidarity instead.
They each had a bit of chocolate from school (I provided cooking choc for DS1 as it's the only type he actually likes) but I am so pleased to have found a solution that seems to work for us :)