UPDDATE:
I emailed the company about manipulatives needed for the second edition, Level A. Here is her response. They have excellent customer service, BTW.
From Rachael at RightStart on 9/2/2013:
Almost all of the manipulatives in the Math Set are used in Level A Second Edition. I went through RS2 Level A Lesson book and did not see the following items listed in the Materials Needed section:
T-Square
Triangles
Compass
Goniometer
Folding Meter Stick
Geometry Panels
Most of those items not needed are fairly inexpensive and because there is such a deep discount for the Math Set (more than $80), so, it may be more cost-effective to purchase the Math Set – although, I haven’t specifically priced it out. Here is the list of items included in the Math Set so you can see what is needed (less the list above): http://store.rightstartmath.com/rs2mathset.aspx.
I hope this helps everyone. I will confirm everything she wrote once I get my new books in this week.
Mollie