Been using lupins for a while, bought a 20kg bag from my local coop.
Great stuff, so easy to use, no cooking. Just let them soak 24hrs before yr trip, add your additives to the soak and off you go.
Beware they expand a lot, fill your bucket 1/4 lupins with 2/3 of water. Don't leave them too long or they will go off.
Great ground bait option to add bulk to your other more expensive offerings, such as other particles or even with boilies. Cheap as chips too.
I have recently acquired 25kg of maple peas too, will start experimenting with them in the near future.