For "Modern" I would take your meaning as "post-Soviet". Assuming this is your idea ….
In English ?
I do not know, except Mr. Conrad's translation of the Viskovatov, and Mr. Gingerich's web-site, both linked above, and both very highly reccommended. If you *carefully* followed the Viskovatov as corrected by Mr. Gingerich where applicable, you will be very close to the correct uniforms in parade dress.
I linked the Viskovatov illustrations – and you can color them easily. This has been quite commonly done since they were published over 150 years ago, and Google image search can often find web-sites showing colored versions.
So, not "on sale", but instead free and available and in English and quite good.
===========================
In Russian ?
The following are quite good, but I have no idea if they are "currently on sale", especially given the current international situation.
Безотосный, Васильев, Горшман, Смирнов & Пархаев (илл.)
Русская Армия 1812-1814 гг.
Москва : Издательство «ВЛАДОС», 2000
Леонов, Попов & Кибовский
Русский военный костюм. Армия Александра I. пехота, артиллерия, инженеры
Москва : Издательство «Фонд Русские Витязи», 2013
Русский военный костюм. Армия Александра I. кавалерия
Москва : Издательство «Фонд Русские Витязи», 2014
Смирнов
Аракчеевская артиллерия
Москва : Издательство «Рейтар», 1998
Ульянов
Регулярная пехота 1801-1855 гг.
Москва : Издательство «АСТ», 1997
1812 – Русская Пехота в Бою
Москва : Издательство «Эксмо», 2008
If you care to take the risk of the Russian internet, torrent depositories and so on (I do *not* reccommend this), you can likely find these works online for free. Your private, non-commercial, academic or "for {Russian] national or social benefit" use of the works would be *legal* in Russia. Your using the books to design figures for sale, or the use of the illustrations in your book offered for sale, would not be allowed.
However, your unauthorized downloading through or into the USA, UK or EU (which creates a *copy* of all or substative part of the work) and/or your unauthorized use of the work in these regions would be in violation of copyright protection laws. By treaty, each nation applies *its own* copyright protections to foreign works, not the protection of the original country. A little ironic, is it not?
Also, your use of an interet connection/servers/etc. from the USA/UK/EU into and out of Russia might violate sanctions of either side, depending on the companies involved.