A few large golf discount outlets do have storefronts. The buying power of these discount golf chains allows them to sell high quality goods at very low prices. The advantage of these chain operations is you can go to the store and swing the club before you pay for it.
As with any purchase, it isn't a deal if you don't actually need it. Make sure you need what you purchase and focus on those brand names you know and trust. Shop around and if possible go to a discount store and try out the golf club you want to buy. Even if you buy it for a lower price online you can get a feel for it at a discount golf store first.