this is the very cheapest they can go because it isn't made by Sherwin Williams they buy it from another company.
In other words, that's the cheapest they can go and still make a $40 profit on you. There's no way they were selling it to -me- at cost, unless some bizarre regional differences are in play.
Make sure you thin the first coat (I was told 20% or so by volume) after the sweat-in and that will be your primer coat. This really helps it to sink into the pores of your flooring.
For your cut in, use a brush that you intend to throw away; you will not be able to salvage it. I used some of those $1 chip brushes, just be aware that they will start to shed bristles after not very long. If you're a perfectionist and will be upset to see a few stray bristles in your epoxy, you can use a nicer brush as long as you're prepared to pitch it. (And when you see how gunky it is, you'll be more than happy to do so as opposed to attempting a solvent clean up on it.)
I got the Epoxy-Glide roller covers from thepaintstore.com, I believe. Order an extra one or two in case you need them.
I need to read into the Rexthane from the sound of it, really not sure what I want to go with...
The stuff is bulletproof, at least so far. It's a perfectly viable coating in its own right, but it works really well to protect your epoxy from UV damage. It has a unique and ridiculous smell to it, but it cures quickly and is a one-part product so all you have to do is stir it up and roll it on (thin!). If you like flakes, throw some in your Tile-Clad topcoat when it's still wet, and then the next day scrape them off and seal them in with Rexthane.