Infotel has different levels of discounts depending on how much you buy. We were Bronze last year, and our agent pushed us up to Platinum. (I assume there's a Silver and Gold in there somewhere. One day I called our agent and asked what the Bronze status meant and how we could change it, and she says 'Let me look....OH you qualify for Platinum!'

) Basically, whatever status you have changes the prices you see on the website.
After we select our items, we submit a quote, and our agent tweaks the prices and reduces the shipping...usually about 5-10% off what our quote was. I'm not sure how it compares with Tigers B2B, I would assume it's the same or maybe a tad less, since they use the same warehouse. We tend to lump orders together as much as we can, since the shipping stays low no matter the order size, unless we order big things like cases, etc.
The computers that we buy from them, Ultra and Systemax, come from a different warehouse, this one from Fletcher, Ohio. The selection is larger and separate from anything on TigerDirect, and pricing is much lower.
As far as the Application thing, we don't use it. I just read up on it while writing this, and it sounds like a program that syncs with them, and shows you exactly what I can already get from the website, and requires a Net 30 account. We don't have a charge account with them at this time, we pay as we order, which imo works better for us. We don't necessarily need a large Infotel bill at the end of the month!
I'll ask our agent about that application thing...and feel free to shoot me a PM for price comparison.