Bookshelf suggestion to buy – US based

I am one of those old people who still reads books. In between jobs and had to move out of my old office. have a ton of academic books – heavy and bulky . office had 2 solid bookshelves with 4shelves each. I want to keep them at my home

dont want to spend a ton. don’t care how it looks just need something that will hold my books in my garage( no space in my home as it is small)

reading is the best pleasure for me and want to keep all my books

looking for suggestions – appreciate your help