GS is NOT supposed to sell you .01 guides so when they say they can't it's legitimate. Every time you do get a .01 guide you're getting lucky since it's against policy.
I was just commenting on the different attitudes at different stores. (even in the same district)
I just noticed something on the PUR site. I bought MW3 used and a RE6 guide two days ago. I got 319 PUR points.
$13.5 for MW3 should be 270 points base + 27(10%) for PUR pro. So 297. Which means I got 22 points for the $.01 I spent on the guide. It seems that the penny guides are similar to the $.02 PS2 games in giving mega PUR points for purchases of them. (1100/$1 for the $.02 PS2 games for sure, and apparently 2200/$1 for $.01 guides)