Bike-On is THE place to get your handcycle. Whether you want a new one or a good used one, Scott will probably give you the best deal on a handcycle you could get anywhere. I have done business with him on two occasions and I have been very satisfied with the results. I will list links to various handcycle producers further down for comparison shopping, but I encourage you to purchase your handcycle here at Bike-On.
Handcycling Times is a resource site with links and handcycling news and articles of interest. They have a bulletin board style forum, riders' profiles, calendar of events, and a buyers' guide. A very useful site!
Quinn's Handcycling Page has a lot of good information on handcycling.
U. S. Handcycling Federation gives you all the information you need to know about handcycling racing.
HandcycleRacing.com offers a variety of services including; news, personalized training, sale of used equipment and information about the sport of handcycling.
Handcycling.com is an excellent resource covering all areas of handcycling.
Faszination Handbike is an interesting German handcycling site worth looking at.
I hope this will be some help to anyone interested.