Note, you will need a Rite Aid Plenti Card to take advantage of this offer. You may sign up for a wellness+ with Plenti card for free online or you may also sign up in-store. More details on the Rite Aid Plenti program are available here.
Editor's Notes & Price Research
There is a limit of 2 offers per Plenti Card; so you may purchase up to 2x $50 eBay Gift Cards and earn 1600 Plenti Points. Plenti points can be used at Rite Aid and other retailers. This sale is valid through 3/19. See forum thread for more details and further discussion.
The Rite Aid weekly ad (bottom of page 3) states limit of 2 offers per Plenti card, but my store has a "limit of 1" sign posted next to the ebay gift cards. So maybe the ad is wrong or each store has their own limits for this offer.
Can combine this with $5 off $15 Rite Aid Amex offer (thanks TOML6576 for the reminder). Can also use the ebay gift card for the 4x ebay bucks offer (8% back in ebay bucks) good thru March 15 (go to ebay front page to activate the 4x ebay bucks offer). Edit: 8% ebay bucks might be a targeted deal or it is no longer available on the ebay front page.
Edit: Looks like many are getting 1600 Plenti points ($16) when they buy two $50 eBay gift cards at Rite Aid. Thanks for reporting back everyone!