[smiley bucket]

train them to come to some nuts rattling in a bucket, then use stones in a bucket for rattling at them, and just give a wee handful of beet pulp pellets from your hand when they arrive.  Cheap and easy.

[Fronhaul]

I spend a fortune on oatcakes and ginger nuts as special treats especially when halter training and for Christmas day.  Ginger nuts for 160 odd take some explaining........

[Marches Farmer]

Do you have a source of windfall apples?  They do have a sweet tooth, as all the biscuit replies show, but cut up apples work just as well.

[ZaktheLad]

Mine love bread and carrots with the odd apple cut in quarters thrown in.