Pins are a lot cheaper to replace than those blades. I say toss the pins and get some shiney new ones.
Speaking of blades.......I use a Fiskar's rotary cutter, and those blades are 3 for 15 bucks. But I found a bargain...At Harbor Frieght of all places. Carpet blades, 45mm ones that fit my Fiskar's, for $1.49 a pack (2 blades). I bought all they had so now I have like 30 blades for 22.00 dollars. They are also sold online at their website if the store is out of stock.