Nairns oakcakes. Found in the crackers isles in any supermarket and about 90p a box.

My 2 are wheat free and these they love

I'm a bit lazy so I buy cheap meat in the supermarket (usually reduced stewing steak or turkey or similar). I cook it up in a shallow frying pan of water then cut in to treat sized cubes and freeze.

I either feed the treats frozen, or just pop a few in the microwave for 10 seconds. I make up enough to last about 2 weeks at a time.

Its surprisingly cheap (about £2 for 300g of meat). If you buy treats in a pet store some are over £1 for 40g and they are not real meat!

Otherwise if you are not in to cooking at all;
Cheese
Hot dog
Dried sausage from pet stores cut up (I keep these in a tub long term)
Dried Sprats ... all make good easy grain free treats.

Thanks for those

Well I made some with rice flour and a tin of pilchards in tomato sauce today, the dogs like them but made the house smell don't think it helped that I managed to burn the the top slighty as our oven is not working quite right I got a few complaints from the family!

Think I will try something different!