Clear a closet & grow in there. If you've got 6 feet of headroom & a couple of feet square floorspace you could grow a couple of full-sized plants. A novice grower can easily pull one to a couple of ounces of bud per plant - 4 weeks veg growth, 10 weeks flowering, that's at least 3 grows a year - if you clone from cuttings more than that, if you keep a seperate vegging space (say in a chest of drawers) that's even more. You can be self-sufficient for herb with surprisingly little space, if you know your growing - it's the way forward, grow your own & dump the dealer, you know it makes sense