eBay
These are what are called small moving boxes at boxshop.ca. I used them to move recently.

This is for a quantity of 20. There are 7 of the 2 cu. ft. and 13 of the 3 cu. ft.

They are unprinted and have no writing or marks inside or out. I kept them clean so I could reuse them or sell them off afterwards.

I bought about 50 of them from boxshop.ca at $2.00 each (for the 2 cu.ft.) and $2.75 each (for the 3 cu.ft.).
http://www.boxshop.ca/product-category/small-moving-boxes/

Inside dimensions are 15.5" x 12.5" x 13" deep for the 2 cu. ft., and 17" x 17" x 16 deep" for the 3 cu. ft.
 
I am now emptying them so I have a number of them to sell.

I am asking $0.95 each, which I think is fair.

They are in decent shape, never wet or stained. I used large clear plastic bags inside to hold the contents so there is very little evidence of use. The boxes did have labels, since removed (sometimes surface paper fibre lifts when this is done but it's not serious and does not affect end use, see the one pic of this).

There is some creasing but nothing to keep them from being reused.

Where the tape was on the ends, there is some residue on some of the boxes.

Originally these were shipped flat, and these have been returned to that state.

This is for local pickup only. I would also deliver free in my immediate neighbourhood so when I see your address after purchase I'll let you know if I can do so.

Usually I do not accept returns, but since there are aesthetics involved here - if you do not like them when you see them you do not have to take them and I will refund your money.

I also have some other boxes to sell off, so check my other ads to see if there are any still available.


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General notes...

Note: Please check my other listings for items of interest. Combined shipping may make a purchase more economical. If you do see something else you like, send me a message and I will see what I can do. Every combination is different and really cannot be done robotically by an app.
 

Note: if it is not clear from the image what you are looking at, email for a high resolution version of the picture shown here.

Note: returns not accepted, unless item proves to be faulty, or is significantly not as described, upon delivery. I take care to represent all items adequately and fairly such that each item will arrive as described, and will perform as described. Should you have any concerns after a purchase, feel free to contact me and your concerns will be resolved in short order, in an agreeable manner. Please review the feedback from previous sales as a reliability guideline.