It's highly unlikely you'll find any of these, especially Meruru, at a reasonable price.
Rorona and Totori CEs were both cleared out early last year by Gamestop. I believe Amazon also had both for $40-ish before they sold out, also last year. GS converted all their remaining copies of Rorona to used (meaning if they had any CEs, they threw out all the extras and sold the game itself as a used regular version) but Totori is still listed there- but it'll likely be the display copy, meaning it'll be opened.
Meruru was exclusive to NISA's store, you won't find it at any retailer.
Your best bet for all 3 is eBay, unfortunately. You can snag cheap sealed copy of Rorona for just under MSRP still ($50-60), but Totori goes for a bit more ($60-80) and Meruru demands a lot more (up to and over $100).