In this thread I'll write about forgotten body swaps that haven't been shared yet. I will focus mainly on DLsite and porn, but know that there are dozens of doujins on Pixiv that are only sold at conventions, and which will never be sold digitally because the artists are too afraid of copyright to sell them online. This thread may help people to find things to buy which they didn't know about.
Recent body swaps tagged with "入れ替わり":
二色の花と二色の蝶
http://www.dlsite.com/maniax/work/=/product_id/RJ218068.html
(Touhou parody, "I woke up as Reika"
びっくりパコパコ!
http://www.dlsite.com/books/work/=/product_id/BJ134758.html
(Original. Someone switches bodies with an Adult Video star.)
君と見る夢の中で。
http://www.dlsite.com/maniax/work/=/product_id/RJ216165.html
(Kimi no Na Wa parody)
メイヴちゃんと5人の男
http://www.dlsite.com/maniax/work/=/product_id/RJ216283.html
(Fate Grand Order parody with "Meigu-chan")
おつとめ
http://www.dlsite.com/maniax/work/=/product_id/RJ216337.html
(Novel. Warning: I think it's possession, not a body swap.)
運命交換は保健室でね!
http://www.dlsite.com/maniax/work/=/product_id/RJ214359.html
(It's a novel, "Destined swap in the school infirmary!")
真夏のハーレムおじさん ～入れ替わり! パコパコJDぱらだいす～
http://www.dlsite.com/books/work/=/product_id/BJ128044.html
It's a series with about 15 chapters so far. Sometimes translating the title says more than translating the summary: "Summer Harem old man~ Body swap! College girl fucking paradise!"
女体化入れ替わりSNSを利用して変態聖水&アナルプレイ願望
http://www.dlsite.com/maniax/work/=/product_id/RJ213628.html
(CG + novel. An app lets him switch bodies with girls he likes, and he seems to become office ladies and "Mama.")
http://www.dlsite.com/maniax/work/=/product_id/RJ213628.html
女体化セックス! あの娘と入れ替わってやり放題!気持ちよすぎの乱交パラダイス～ フルカラーコミック版
http://www.dlsite.com/maniax/work/=/product_id/RJ212012.html
("Is this a dream?! I switched bodies with a girl, it's a sexy story really. One day I became the senpai I had longed for. It was magic and this wast the ideal chance to try masturbating, and it was astonishing how good it felt...")
男女の価値観が入れ替わった世界 ドスケベお姉ちゃんと僕
http://www.dlsite.com/maniax/work/=/product_id/RJ210413.html
ちっちゃな少女と入れ替わり催眠!東南アジア売春婦体験ツアー
http://www.dlsite.com/maniax/work/=/product_id/RJ209946.html
(Hypnosis audio track. "Switching bodies with a little girl and hypnotized! South-East Asian Prostitute Tour~!)
清楚で美人な憧れの生徒会長と入れ替わってビッチなバカ女デビュー
http://www.dlsite.com/maniax/work/=/product_id/RJ210281.html
And now we are in October 2017, since I've been listing them in reverse chronological order. I hope I have shown you just how much stuff won't ever appear on e-hentai.
(Video unrelated, but I needed a thumbnail.)
https://youtube.com/watch?v=M6ajxG4t7L4