u dont even ned to buy, they all eat bramble and privet and you can get privet from anyone who has a privet hedge, i usually slyly chore some when noones lookin since my neighbour cut his privet hedge coz it was severly over grown, brample can be found no bother in woods, its blackberry plants but watch out coz theyre thorny as razorwire. you dont need to buy any plants at all