On the Brazilian PSN store right now, these games are completely free. Not sure how long they will be up or if it's a glitch or something, but they're free right now, so get in while you can.
Click the link, which will take you to the Brazilian PSN store page for Ratchet & Clank: Full Frontal Assault (open the link in incognito mode if you're already signed into the PSN and don't want to sign out) and make a Brazilian account. From there, you grab this game for free, which will then, upon purchasing, unlock the cross buy version of the game, so both the PS3 and Vita versions, and at that point you'll also gain access to Ratchet: Deadlocked for free too, all the games should appear in your download list just from that initial click but it's worth a double check just in case.
Sign in as this account on your PS3 to download the games, and then play them on your main account if you want to snag a couple of decently easy and enjoyable platinum trophies for free. Or just enjoy the games, that's an option too. Obviously the Vita version of FFA will only work on the account that downloaded it, but since it's a shared trophy list for both versions it's all good.
Included, just for a wrap up
. Ratchet: Deadlocked (known as Ratchet: Gladiator in Aus), PS3
. Ratchet & Clank: Full Frontal Assault (known as Ratchet & Clank: Q-Force in Aus), PS3 AND Vita versions
All for freezies.
A shame but unable to change vita account easily made me refuse to make a new account just for the sake of vita.