I like King's Tacos at Dufferin & St Clair, but they're not that cheap anymore. Have also heard good things about Tenoch a bit east of Oakwood and takeout joint Itacate, although haven't personally tried them.
There's some Mexican places at Dufferin & Eg, and Keele & Eg too. I've been to El Sazon de la Tia Flor, who have $1 tacos on Tuesday and Wednesday. Granted you'll probably order 8 to 10 of them in total, but I found them pretty solid for what you're paying
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