Your best bet is Japanese sites like AmiAmi, HLJ (HobbyLink Japan), or Play-Asia. Prices there are usually fair, and shipping from Japan eats into your savings a bit, but the boxes arrive in decent condition and you're guaranteed originals. You register, find the character you need, pay - it's straightforward. The downside is shipping can take weeks, and sometimes figures sell out on Japanese sites too if it's a popular character.
For Russian options - try smaller specialty anime shops rather than big marketplaces. Sometimes they work directly with distributors and keep prices lower. Hunt around on social media for S.H. Figuarts collector communities - they often recommend specific shops they've actually dealt with. The main thing is check reviews so you don't run into fakes, especially if the price looks too good to be true.
Another option is keeping tabs on reprints and pre-orders through Bandai's official channels when a figure gets announced. Right when it drops, prices are reasonable, then the hype and scalping kicks in. If you're not chasing exclusivity on some rare release, it's better to grab newer character versions - cheaper and usually better quality 😊