If they have them in stock, buy them. They're so good for your reptile! Great quality too. They always overcount by a few too.
Symton has the best silkworms hand down. Don't bother with the other vendors; these are always the freshest and largest, without any dried up food like I've gotten in cups from other companies.
Symton always has the best quality silkworms of anyone I can find, I really appreciate it. They also have them consistently in stock, which is nice!
My guy loves Symton superworms. I recommend them to everyone I know.