Tomorrow's PSN content dump unlocks Plants vs. Zombies on the PS Vita for all PS Plus members, free of charge. The usual asking price for Popcap's tower defense darling is $10.49 – PS Plus members will find the free game available in their Instant Game Collection when PSN updates tomorrow.

In addition to the free game, the PlayStation Blog has given us a look at some of the discounts on offer in this week's update. Quirky rhythm game Retro/Grade from 24 Caret Games will be on sale for a mere $2.44 this week, plus the winners of the PSN Gamers' Choice Awards contest have been determined – a promotion that asked gamers to vote on which games they'd like to see discounted. Highlights include reduced prices on PS All-Stars: Battle Royale, Sound Shapes and Escape Plan.

This article was originally published on Joystiq.