I ordered some parts on Friday. I noticed that they are now offering a new budget shipping option.
There's not too many details on mouser.com - so I went ahead and gave it a go. It turns out to be "STANDARD SHIPPING MAIL INNOVATIONS" - it's a service from UPS. Basically, UPS hands the package off to USPS to deliver to your door. So your shipping time will vary greatly depending on how far you are from mouser's headquarters (Mansfield, TX 76063)
Even still, it appears to be a flat rate - and for $6 - that's not too bad. As someone that's *loves* mouser, but hates their insane shipping costs, it's a welcome change. (don't get me started on how they love to package a just hand full of parts into a huge box and then charge you for "dimensional weight")
Now, if they would just do free shipping on orders over $100, I'd be in love. Anyways - hopfuly this new option will help a few of you save some money.