I went crazy with silica gel at first, but I think I got my sees TOO dry some of the time. Now I use smaller pkts and don't change them until the RH gets up to 20%
The little humidity-indicating cards are pretty handy, but ULINE only sems to sell 400 / $35 as their minimum order (18 cents each).
http://www.uline.com/Product/D...
These from Drierite can be bought as onsies or twosies for 40 cents each:
https://secure.drierite.com/ca...
