We have all our records in Foremost storage cubes. The prices vary; sometimes they're cheapest from Target, sometimes Amazon. They're great! We don't have any books in ours but of course you could put books in them.
I got a 12 of those, the side by side 1x2's ones. They aren't bad. I've been using them for close to 10 years now.
You can try this out. You can sort of customize it to your desired layout by getting more units to link together or you can separate it if you think it's too big.
I got this one on Amazon a while back.
https://smile.amazon.com/gp/product/B000O1APF0/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&th=1
Looks like it's currently out of stock right now, but when I was looking at buying it, it was back and forth for a while, so it will probably be back in stock soon. I think it was around 30 bucks.
Comes with 2 shelves that hold about 55 LP's give or take, sturdy and looks pretty good I think:
They’re unavail right now but this is it! You should be able to find something simliar! Foremost 327806 Storage System, Large 30-inch, Black https://www.amazon.com/dp/B000O1APF0/ref=cm_sw_r_cp_api_i_tgb8DbJEDRFMR
They’re unavail rn but I hope this helps! :) Foremost 327806 Storage System, Large 30-inch, Black https://www.amazon.com/dp/B000O1APF0/ref=cm_sw_r_cp_api_i_tgb8DbJEDRFMR
Foremost 327806 Modular Large... https://www.amazon.com/dp/B000O1APF0?ref=ppx_pop_mob_ap_share
I have 3 stacked on top of each other and 3 single cube versions aside them, so essentially 3x3.
Another option for storage cubes https://www.amazon.com/gp/product/B000O1APF0/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
Just installed some of these for 12"s.
I just picked up this black 2x1 by Foremost on amazon: http://www.amazon.com/Foremost-327806-Modular-Divided-Storage/dp/B000O1APF0/ref=pd_bxgy_201_img_y
It's decent. Especially for the price.
Edit: They have it in white and it's only $24!
I picked them up on Amazon: Foremost 327806 Modular Large Divided Storage System, Black https://www.amazon.com/dp/B000O1APF0/ref=cm_sw_r_awd_PYJWub1YC6M13 https://www.amazon.com/dp/B000O1APF0/ref=cm_sw_r_awd_PYJWub1YC6M13
I like the fact that they're modular so I can add more as my collection grows.