Sprouting mean they have been exposed to moisture. Bulbs that sprout before planting start off weakened because they are using stored energy from inside the bulb. Look for bulbs that are loose in bins. This will allow you to hand-pick good quality bulbs. When buying bulbs, big is better because the larger the bulb, the more food the bulb has in reserve for next spring.
Larger bulbs are more likely to produce stronger stems and more blooms.
Initial bulb size also influences how long bulbs last. Avoid buying bulbs at a grocery store or discount store that sells them packed in mesh bags. It is difficult to see what you are getting and there are often a few smaller bulbs in with a few larger ones, not unlike that one large potato in front of the mesh window in the potato bag. It is also not a good idea to purchase bulbs from anyone offering a large assortment of bulbs for a single low price. You may be getting quantity, but not quality.