Your search for "Eren Jaeger x Armin Arlert" revealed the following:
Hetalia Axis Powers YAOI Doujinshi - Superpower Submits (USA x UK / Alfred x Arthur and Mob x UK)
$ 40.95Product details: USA x UK / Alfred x Arthur and Mob x UKCan America save England from some hankypanky shakashaka...
Persona 5 Doujinshi - FtB (Ren Amamiya x Futaba Sakura / JOKER x Futaba / Akira Kurusu x Futaba / Protagonist x Futaba)
$ 33.95Product details: Ren Amamiya x Futaba Sakura / JOKER x Futaba / Akira Kurusu x Futaba / Protagonist x FutabaFor...
YuGiOh! Duel Monsters YAOI Doujinshi - Millennium Kingdom 14: King's Return (Atem x Seto / Pharaoh x Seto / Yami x Seto / Yami x Kaiba)
$ 33.95Product details: Atem x Seto / Pharaoh x Seto / Yami x Seto / Yami x KaibaWill Seto welcome the...
Persona 5 Doujinshi - JOKER - R (Mob x Ren Amamiya / Mob x Protagonist / Mob x JOKER / Mob x Akira Kurusu)
$ 33.95Product details: Mob x Ren Amamiya / Mob x Protagonist / Mob x JOKER / Mob x Akira KurusuJOKER services...
Gundam 00 YAOI Doujinshi - The POW and a hard candy (Allelujah uke and Hallelujah uke.)
$ 33.95Product details: Allelujah uke and Hallelujah uke.When soldiers and scientists abuse Allelujah his other ego emerges to protect him. Who...
Blazblue HENTAI LOVE Doujinshi - Break Blue: Eizen / Maiden (Ragna x Noel Vermillion / Ragna x Noel / Ragna the Bloodedge x Noel Vermillion)
$ 33.95Product details: Ragna x Noel Vermillion / Ragna x Noel / Ragna the Bloodedge x Noel VermillionJust what kind of...
Attack on Titan Trading Card - AOT/S35-038 U Weiss Schwarz Strangest Member of the Corps Hange (CH) (Hange Zoe / Hans Zoe / Hanji Zoe / Hange)
$ 20.95Product details: Hange Zoe / Hans Zoe / Hanji Zoe / HangeThis lovely card is from the Weiss (Weib) Schwarz...
Attack on Titan Trading Card - AOT/SX04-047 RR Weiss Schwarz (HOLO) Mikasa: Recovery Mission (Mikasa / Mikasa Ackermann / Mikasa Ackerman)
$ 20.95Product details: Mikasa / Mikasa Ackermann / Mikasa AckermanThis beautiful card is hard to find! Try to collect them all!Item...
Fire Emblem Fates Doujinshi - fleeting (Leo x Corrin / Leon x Kamui)
$ 33.95Product details: Leo x Corrin / Leon x KamuiCorrin loves Leo, but does he feel the same? Or is Camilla...
Blue Exorcist Doujinshi - Dark Noon Milky Night (Yukio x Rin / Yukio Okumura x Rin Okumura)
$ 26.95Product details: Yukio x Rin / Yukio Okumura x Rin OkumuraItem Title: Dark Noon Milky NightProduced by: Vinyl Pink (Marshmallow...