I just copied this from Easy Performance's website:
Reflective Silicone Intake Duct, 3800 Series II 3800 Series II $15.00
Reflective Silicone Intake Duct, Intercooled 3800 Intercooled 3800 $25.00
Reflective Silicone Intake Duct, LS1 TB-MAF 3800 with LS1 TB & MAF $30.00
Reflective Silicone Intake Duct, Series III 3800 Series III $25.00
I guess prices went up a tad at the first of the year since I was checking before for a series II duct and it was $10 at the time, but it still isn't too bad.
Yeah I don't know that the ribbing makes a big deal, especially on a fuel injected motor. Back when I had a carb the turbulent air was more of an issue in that situation.
Over the winter I ran a HAI and I used ZZP's silicone coupler and man did I like how that worked. It didn't get all mangled up and I didn't have to worry about whether or not it was air tight on the TB. I want to try a 45* elbow and a length of 4" pipe, but I don't know if it will match up with the opening on the Wizaired box. Something from these guys: Intercooler Pipe Fabrication - Silicone Intake Systems Auto Parts
