Not cheap as chips, but I would THOROUGHLY recommend the Morphy Richards 48715 (6.5L) and it is FAB. You can fit masses in there, I regularly do meal sizes for 8 and then freeze half.
When my ancient Morphy Richards broke down (it really lasted a long while) I replaced with a Tefal which was unbelievably crap - food just wasn't being cooked through properly even with the proper timings - so much so that I ended up just replacing it for the Morphy Richards above which works brilliantly.