Lockable truck bed box suggestions

Hi all. I have a backflip bed cover and am looking for a lockable box to put in my bed to lock a few bags for added security. Maybe 2-3 school type backpacks.
Any suggestions for simple and affordable solutions?

thanks!

 

Lock your tailgate first if you don't have a tailgate lock.

Honestly most thieves are opportunistic and won't go beyond checking to see if something is locked.

$191 Pop & Lock – Power Tailgate Smart Lock Combo with Bolt Technology for Toyota Tacoma, Fits 2005 to 2015 Models (OEM Color Black, PL8540)

https://www.amazon.com/dp/B00LFM3XPG?ref_=pe_2640190_261118450_302_E_DDE_dt_1

Is the one I used for a 2010 Tacoma DCSB, Faded a little bit after 2 years but still works perfectly

 

Oops sorry I should have mentioned I already have a lockable tailgate. Just wanted an additional layer of security. The backflip is really easy to open. All you need is a coat hanger…..

 

No issues.

I'm unsure if you have a Tractor Supply there but i'm sure other companies make them.

https://www.tractorsupply.com/tsc/product/tractor-supply-single-lid-chest-tool-box-silver-46-in-l

Less Expensive, Lockable, I had one for a long time on my Sierra, I beat the crap out of it and I never had issues locking or closing.

 

Gotta be something that will fit under the bed cover

 

They should.
It's pretty low, I think it's under the rails either.

 

Thank you. Not available here.