They are getting harder to find. My new desktop from Micro Center has all the space but no external drive bays. I also had to find out how to open the internal compartment to install my internal Sata SSD drive.
The easiest way to find cases with 5.25" bays (or w/e you require), is to use PCPartpicker's navigation system.
You can also select the country at top right.
For example, here's a list of mid tower cases, sorted for ATX motherboard, no included power supply, and 2x 5.25" bays.
On the left you can see other options to sort for. At top right you can also choose price, lowest to highest, etc.
Choose A Case
pcpartpicker.com
Best of all... after you sort for w/e you want, and then sort by price and country... PCPartpicker will find the best prices from all the etailers available to you, in that country.
If you "add" the item to the cart, you can then click on the items name, and see ALL the etailers in your country that have the case, and the price they are selling it for.
Here's the PCPartpicker page I have book marked. At the top just click on
Browse Products...
Don't forget to choose your country at top right.
pcpartpicker.com
Also at the top (left-ish), you can click on
System Builder, if you're gonna build a whole computer.
Here's the order I do things... (about 10 years, using this site)...
At the top I click on either
Browse Products, or
System Builder
Then I start with a component type.
Do my main sorting, down the left side.
Choose the country at the top right.
Pick the component I want from the resulting list.
Click ADD.
You don't buy from PCPartpicker, at the end of the line for each chosen component, you'll see a BUY button.
That will take you to the site with the lowest price.
After you have your... list (one part or many), you can click the item name to see ALL the etailer that sell the part and for how much, then you can click the little
gear icon, to choose whatever site you like the best.
If you make a free account there, you can also SAVE parts lists.
When posting a PCpartpicker page in a forum, choose the link in the address bar for a single item, or page.
Choose the link on the left of the PCPartpicker page to link to a cart (aka completed build).
Here's a quick little $30,000.00 system I just whipped up... just add this to your Christmas list. 
PCPartpicker would only let me add one video card, but you can buy more... singly.
Btw, those are OLED monitors. But, they are only 21.6" so you can substitute with 4 of these...
Dell UP3218K 31.5" 7680 x 4320 60 Hz Monitor (UP3218K)
pcpartpicker.com
Part List - AMD Threadripper 3990X, GeForce RTX 3080 Ti, Phanteks Enthoo Elite ATX Full Tower
pcpartpicker.com