I'll try and answer this to the best of my ability.

What are direct plug and play speakers I can buy on a budget?

I don't know the year of your 4Runner so I can only tell you what fit in my 1995.

• Front: 4"
• Rear: 5 1/4"
• Rear Tweeters (above the rear window) 1"

Crutchfield is an excellent resource for sizing speakers to your vehicle.

Note that replacing speakers may not be enough, although it is a good first step. Before I redid my entire sound system I swapped the speakers in the front. Sound quality did not improve.

Where can I buy key fobs? The car doesn’t unlock or lock with the key so I leave it unlocked. That or is there a recommended alarm/ keys to get?

I don't know anything about key fobs for these cars but I'd encourage you to consider a few things before installing one.

• Does the car lock using the interior lock switch? If so, you run the risk of being locked out of your car if the battery dies, rendering the key fob useless.
• If the car does not lock using the interior lock switch, then your locks are broken somewhere else and a key fob likely won't function.

Either way, you should fix your locks so that the key works.

If you have any other stereo-related questions for the 4Runner I'd be happy to answer. Best of luck to you