Here are links to some web sites I think will be useful to you. As well as connections to sites that provide information about plants and gardens, there are others to mail order sources for plants and supplies.
Fall is for planting, and planting bulbs ensures a beautiful spring. These buried treasures packed in a plain brown wrapper hold a rainbow's worth of flowers. Summer is not too early to order, so you can choose from the widest selection.
Bulb Information Lots of useful information - general advice on how to grow bulbs in the garden, pot them up for early flowers indoors, and specific information about some bulbs.
Garden Web Bulb Forum A forum where both beginners and experts alike can post questions about any kind of bulb (and answers, if you have them!)
Netherland Flower Bulb Information Center For helpful information including advice on growing bulbs, useful tips, interesting facts and amusing fairy tales.
The Geophyte Page Geophyte is a fancy way of saying "earth plants" (just as epiphyte refers to plants that grow in the air, like bromeliads.) Though aimed at commercial growers this fact-filled site has a lot of useful information for home gardeners too.
The International Bulb Society This is the place to go and the society to join if you are a dedicated bulb lover. As well as familiar tulips and daffodils, here is where you can find information about funky far-out bulbs like Scadoxus, Lycoris, and Rhodophiala. Useful online information open to all, while membership benefits include, among other things, a forum, a journal and a seed exchange.
Dutch Gardens Just like their paper catalog that displays page after page of tulips, daffodils, hyacinths, a good selection of smaller bulbs, and more. There's planting information, advice on selecting which bulbs for sun or shade, deer resistant, or cut flower use, and how to plant a container. Minimum quanitity 5, 10, 15, or 25 bulbs per bag, depending on type. Credit card orders not charged until bulbs are shipped.
John Scheepers Tempting full color pictures offer an exciting selection of tulips, daffodils, hyacinths, lilies, and many smaller bulbs. Order online or request a paper catalog to drool over. Minimum quantities 10 or 25 per bag, depending on type. Minimum order $35 to one address, not including shipping.
Van Engelen Sister company to John Scheepers, this is the place to order if you need larger quantities of individual varieties. Minimum quantities 100, 500, or 1,000 per variety. Minimum order $50 to one address, not including shipping.
Brent and Becky's Bulbs The Heaths have that rarity these days, a family owned and operated company. With a particular interest in daffodils there is, as you'd expect, an excellent selection. They also offer a wide range of other familiar and less common bulbs including Rhodophiala. An easy to navigate site makes ordering simple.