Also, I went to a local shop and they hooked me up with probably 20 cedar sheets for free. I also have some pen blanks on order from Amazon. I plan to place them in the bottom around the trays, in the gap between the tray and tote walls. I'll also place a couple in some of the baskets.
Also amazon. I bought a pack of 10 for my tuppadoor. They are 1x1 and about 6 inches long maybe.
Edit I guess they are ¾x¾x5 Pen Blank 10 Pack- Spanish Cedar https://www.amazon.com/dp/B00H1EY0FO/ref=cm_sw_r_cp_api_i_ymcfBbDARJ96K
Tray, block, strip, veneer sheet... it’s all the same. Adds a woody aroma that you’d normally get from a cedar humidor but won’t get from a plastic box.
Blocks I used: https://www.amazon.com/Pen-Blank-Pack-Spanish-Cedar/dp/B00H1EY0FO