I bought a cosplay uniform from a well-known なんちゃって制服 brand, conomi, using the buyee x mercari partnership. Conomi is a super expensive brand if buying their items at regular price on rakuten so I opted on using buyee to help me buy conomi items from mercari. I got a skirt + tie set for only ¥2700! (On rakuten, a skirt costs ¥9800 & the tie ¥1800). The items I got were all in gently used condition which I didn’t mind since I was going to use them for cosplay. I then bought a white blouse to complete the uniform for ¥1800 (retail priced at ¥3800).
Buyee does have a few additional charges. Once all their items have arrived at their warehouse you have the option to consolidate your package so you don’t end up paying a huge fee to ship your items separately. Consolidating 2 items = ¥500 ... 3 or more items is a flat ¥1000 fee I believe. When that is all complete, you have about 6 international shipping options to choose from. All costs are displayed, from most to least expensive options as well as the shipping time estimates for them.
Overall I’ve had a positive experience with buyee and saved lots of $ from buying a brand new cosplay uniform from rakuten. Customer service is good and usually responds to inquiries within a day. Would recommend using buyee to buy mercari items if you intend on buying a few items. If you plan on buying lots of items, buyee’s mercari fee can really add up to your final buyee total.