You can have custom cabinets built- cost of lumber is high now, don't know what availability is of cabinet making level carpenters where you are, but I ran out of room with an entire floor for storage in a large (5400 sq ft or so) house in NY. Build ins were a little more than the Ikea stuff (which is good on the cheap- I use them here in TX, but substantially reduced the number of albums pre-move); people tend to prefer some racks that show the face of the album rather than the spine, but given the number of records I had at one point, that simply wasn't possible.
Custom also allows you to take advantage of various areas that are unsuitable for a free-standing shelving system. Worth pricing that route as you look at ready made.
Custom also allows you to take advantage of various areas that are unsuitable for a free-standing shelving system. Worth pricing that route as you look at ready made.