For a secondary resource one of my favorites is mathbits.com. Has lots of good teaching ideas and resources such as online calculators, graph paper, etc…
This blog is written by Ian Jukes (company) - there are a lot of great technology ideas within these pages. Become a Committed Sardine today to learn more.
Browse the collaborations category to see options for video conferencing in your classes. Contact Trey if you want to proceed with one of these opportunities. Make sure you note that some of these opportunities will cost money; however, might prove to be less expensive than a full field trip.
Hippocampus in partnership with MoVIP offers free online curriculum for a variety of courses. You can create a logon and use these online materials in your classroom. You can also bring the videos into your Blackboard course.
This site is an excellent series of free online tools to explore for use in your classroom. Be sure to add those items that would be useful in your classroom to this diigo site.