Thank you once again for your help! I just have one last question I'm hoping you can help me with:

I'm trying to make a conditional statement that will do one of two things...

(a) If order weight is 0, make the shipping charge $5.00 and ignore the USPS rate quotes. Ideally, it would still display as USPS Priority Mail [2-3 days] as the existing USPS module does, but not pull the rates from the USPS site.

(b) If what I've outlined in (a) can't be done, then is there a way to add a handling charge to First-Class Mail only? So, if you have a 0 weight order, offer First Class Mail at rate quote + $3.00 as well as Priority Mail at rate quote, with no handling charge?

Thank you!!!