I've gone ahead and taken a look at the html headers on the images of some of the more recent releases on Takara Tomy Mall and a few other sites. Hopefully this will help us infer the timeframe for when Beyblades go up on each store. For
Amazon.jp though, I think they just put the images up onto their server earlier. I distinctly remember the listing went up AFTER Takara Tomy Mall had put theirs up.
Release dates:
Nightmare Longinus: November 11, 2017
Spriggan Requiem: December 28, 2017
Twin Nemesis: January 27, 2018
Amazon.jpNightmare Longinus: 10 Oct 2017 02:27:43 GMT
Spriggan Requiem: 14 Nov 2017 23:52:14 GMT
Twin Nemesis: 22 Dec 2017 04:55:11 GMT
TTMall
Nightmare Longinus: 16 Oct 2017 02:54:40
Spriggan Requiem: 15 Nov 2017 06:30:21 GMT
Twin Nemesis: 26 Dec 2017 07:54:55 GMT
Hobbysearch/
1999.co.jpNightmare Longinus: 16 Oct 2017 02:05:07 GMT
Spriggan Requiem: 15 Nov 2017 05:50:23 GMT
HLJ
Nightmare Longinus: 16 Oct 2017 07:35:47 GMT
Spriggan requiem: 15 Nov 2017 02:50:41 GMT
Twin nemesis: 28 Dec 2017 05:30:31 GMT
Amiami
Nightmare Longinus: 28 Oct 2017 08:17:13 GMT
Spriggan Requiem 29 Nov 2017 08:25:11 GMT
In summary, Takara Tomy puts up releases for preorder at least a month in advance of the release date and most releases happen towards the end or middle of the month.
Hobbysearch puts up their listings pretty much at the same time as the ones that go up on TTMall, though they seem to be missing Twin Nemesis at the moment for some reason.
HLJ puts theirs up within 5 or so hours of an item showing up on TTMall or within the first few days.
Amiami seems to put the listing up whatever date they want post-announcement, but at the very least they are somewhat consistent about what time they put up listings.
Buying toy tops should not be this difficult...
