I found a website that offers 3DS capture card installations. Would you say the prices are fair? These prices are significantly higher than what Katsukitty and Loopy charged if I'm not mistaken :
SALE! NEW NINTENDO 3DS XL Capture KIT Bundle - KATSUKITY CAPTURE | LOOPY USB-C | eBay
New Nintendo 3DS/2DS XL Wireless Capture Card / PC Streaming Service / Twitch | eBay
Thought this subreddit might like my grey-blue PAL phat DS that I installed a USB Capture Card onto. DS: £20 eBay. Capture card: $65 from 3dscapture ( Loopy). : r/nds
INSTALL SERVICE - NEW NINTENDO 3DS XL - KATSUKITY CAPTURE KIT | LOOPY USB-C | eBay
Nintendo New 3DS 2DS XL Streaming Wireless Capture Card Plays 3DS/2DS Games | eBay
Hdmi Video Capture Card: Hdmi Capture Card with 4K 1080P 60FPS Game | eBay
Test DS Capture page - SDA Knowledge Base
SALE! NEW NINTENDO 3DS XL Capture KIT Bundle - KATSUKITY CAPTURE | LOOPY USB-C | eBay
Nintendo 3DS Console Red with Loopy Capture Card in original box. | eBay
Both of my prized Nintendo possessions, a 3DS capture unit from Loopy & an N2DSXL capture unit from Merki! Shame there's not more people making these still. : r/3DS