Not only was it hard to stay under $15, I could barely choose only 5 skaters.
Jammer: Christie Demons ($4), no explanation necessary
Pivot: V-Diva (a steal at $2), the London vs Gotham game makes the case for V-Diva as a pivot.
Blockers: Bicepsual ($4)(no one goes one on one last line of defense like Bicepsual), OMG WTF ($3) & Kid Block ($2). All three of these skaters destroy jammers.