Where to buy garlic

I’m hoping to plant some garlic to overwinter in my allotment once I’ve cleared a space for it. I’ve been looking in my local garden centres but they don’t seem to have any in stock, is it too early? Or should I just order online?

I got some bulbs from Wilkinsons at the weekend - Germidour. They had another type of garlic as well, but I've forgotten what it was.