Here are two different professional special education organizations that I found. The first, MAASE, is a state level organization and the second, NASET, is a national level organization.

Michigan Association of Administrators of Special Education (MAASE)
Website: www.maase.org
Twitter: @maasemichigan

MAASE is a group of people who are "dedicated to the enhancement of the worth, dignity, potential, and uniqueness of each individual in society...The Mission of MAASE is to provide leadership for the development and implementation of quality programs and services for students with disabilities within the total education community." (Taken from www.maase.org/index.php)

Membership: $80
                      $45 (non-voting associate membership)
I tried to research what is included with a membership or what a membership entails for each individual, but the website is currently under construction and there is no available information. I did however find that there are three different levels of membership: national, state and nonvoting. I cannot tell if there are any magazines or periodicals included with a membership due to it still being under construction and not having available information.

MAASE holds meetings on Tuesday nights for professional learning. There is also a summer institute of learning available. MAASE also has a preschool least restrictive environment project that they are currently working on. Both of these events are free if you are a member.

National Association of Special Education Teachers (NASET)Website: http://www.naset.org/
Twitter: @NASTEmembership
Facebook: https://www.facebook.com/nasetmembers
Pinterest: https://www.pinterest.com/nasetmembers

The mission of NASET is to "render all possible support and assistance to professionals who teach children with special needs. NASET seeks to promote standards of excellence and innovation in special education research, practice, and policy in order to foster exceptional teaching for exceptional children." (Taken from https://www.facebook.com/nasetmembers/info?tab=page_info)

Membership: $59/year or $95/two years
Student membership: $50/year or $85/two years

The benefits of being a NASET member include:
-professional development courses
-weekly e-mail of stories, topics and issues from the field of special education
-research based articles in the field of special education
-a list made by educators of the top 100 forms, tables, checklists and procedures
-special education e-journal
-nine part series of discipline of students in special education
-monthly education resource about assessment in special education
-series of lesser known disorders in special education
-E-publication of the latest learning disabilities
-parent teacher conference handouts
-behavior management series
-resolving disputes with parents series
-question and answer corner
-classroom management series
-RTI (response to intervention) roundtable
-genetics in special education series
-working with paraprofessionals in your school series
-master curriculum to be used when developing lesson plans
-exceptional children and disability information and practical resources
-special education and the law database
-audio lectures
-power point presentations
-career center
-membership certificiate
-national listing of conferences and workshops for special education teachers
-news alerts
-professional reference library
-teacher to teacher forum
-"The Practical Teacher" (a monthly resource filled with tools, tips and strategies to use inside and outside of the classroom)
...and that is just the beginning of what a membership includes!

There are two conferences held every four months (February, June and October). Each conference has a different topic and presents different information regarding special education. There are trainings, workshops and lectures. Some of them just go all day and others last more than one day.

NASET also has apps for phones and iPods/iPads and sells many of their items through Amazon.