I concur, I have ordered from both places and they are both top notch. Also if your looking for hornworms (both of them have it) as well as http://www.greatlakeshornworm.com/ which is also "top notch" and I would recommend any of the 3.
I just ordered from Costal last night and supposedly has shipped already (I just checked) and I got my hornworm egg pods from Great lakes and they are great as well. I will be more than likely ordering more from them in a week or so. This is my first batch of silks, and I hear they are better than horns.