I paid just north of $5,000 for my new Loop-Loc cover 2 years ago. Since I have a freeform pool, it had to be custom ordered.
The price you were quoted doesn't sound outrageous to me, being that it's from Loop-Loc.
There is a fabric supply house in OKC that I know carries the same fabric, nylon strapping, fittings, etc. that Loop-Loc uses, and, if I remember correctly, they are actually an approved repair shop for Loop-Loc products. They are also a fully-equipped and experienced upholstery and sewn goods shop (they spend most of their summers making "rig tarps" for drilling rigs to use in the winter months). In other words, they can make you a Loop-Loc cover, and probably for less money. It just won't have the Loop-Loc warranty associated with it (which, IMO is a joke to begin with...).
If you're interested, I can PM you their information.