I've used both OPT and Opticsplanet in the past and enjoyed great service. Both of which you can save further by getting a 5% discount on your order.
To get 5% off at OPT, sign up for their "Free Lifetime Rewards for Members of Astronomy Organizations" on your next order.
http://www.optcorp.com/product.aspx?pid=7185
Just tell them about being a member of IceInSpace (I gave them the URL and my username if they wanted to confirm) and they'll sign you up. Worked for me.
Opticsplanet can be done by finding the many coupons they give out. I found one which worked here:
http://www.tjoos.com/Coupon/65931/Optics-Planet
Enjoy.