There's only one LQS in my town, so luckily there are a couple of 'drop-ins' a week as well as scheduled classes.
The cost is £5.95/$9.60 per session (3 hours) and the price includes as much tea, coffee and biscuits (cookies) as you want, as well as a teacher on hand to help if you need it.
You have to reserve a place in advance as well a machine if you don't want to take yours.