That particular pair I got shipped in directly from China using the Aliexpress Web site. That was in late 2014 I think, so its been awhile and I dont think the same thing would be available now but go to
http://aliexpress.com and search on mens skinny jeans and there are a ton of options.
The Asian guys like their jeans to fit really really tight but generally I've found that if I order pairs in 30 inch waist There is no problem getting into them. They do not seam to have a numbered inseam, but my experience has been that the 30 inch waist is about a 30 inch inseam as well. You will get a good idea of how Asian guys like to wear their jeans if you do the search I suggest.
My currently available favorite light blue denim jeans come from Hollister at this link.
https://www.hollisterco.com/shop/us/...&faceout=model
I also have a similar pair from PacSun.
https://www.pacsun.com/pacsun/light-...+Jeans&start=4
The Hollisters fit slightly snugger, but that is a really close call.
Both pairs are very well made and from heavier denim than the Aliexpress versions. Both Hollister and PacSun have lots of 50 % off or BOGO sales which means the net price ends up being $25 not $50.