In this area we have two garlic festivals, one in September, one the beginning of October. The vendors have great quality and you can pick out what you want. You might check and see if there is something similar nearby. Last year one vendor offered really large bulbs (not just Musik) and they did spectacularly for me - a little more expensive but worth it!
When you order you get what they send with little choice on size. That is not to say there aren't good places, but I have never ordered online.
Here is a link to a Garlic festival in Connecticut. Don't know if it is in driving distance for you or not. Looks pretty interesting!
http://www.garlicfestct.com/
Good luck!