Any BP liquor store. I just checked my cupbpard I have 2 50 ml bottles (holy hechsherim) left over from last Purim. (choclate & pear). If you are asking about hard liquors there is plenty of that.
the store on J is a great place. Last year I bought these really nice bottles and they were less than $1.50 They had many choices for under $3 and the service was great!!