Those look like a good deal..
PEC-PAD Lint Free Wipes 4"x4" 100per/Pkg
$9.59 on amazon. Are these like a paper wet-wipe or are they a cloth?
I currently buy micro-fiber 'glass cleaning' cloths from the dollar tree store. These are micro-fiber towels. I cut them into small squares.. so I get 16 or 32 for a buck depending on how small I cut them. They also have micro-fiber cloths for eyeglasses but its like one small cloth for a dollar.
Regarding the expensive name-brand cloth at the camera store, what a ripoff! And it says you can wash them to reuse them, but I wouldnt trust that. You get particles of dust on the cloth and then you end up scratching the hell out of the glass. I use them once and throw them away. Thats the only way to go.