The homer heard ’round the world had Yankees marketers seeing dollar signs – even as the crack of the bat was still ringing in fans’ ears.

Within minutes of Alex Rodriguez’s milestone, a commercial pitching a $129.95 Louisville Slugger commemorating the 500th homer popped up on the YES Network.

“We’re getting a lot of calls,” one sales associate said.

The tribute bats – which are being peddled by Hampster Direct – are limited edition, with yesterday’s date, and a copy of the newest member of the 500-home-run club’s signature, according to the Web site.