FASTSNAIL vía Amazon has joy con handle for the Nintendo switch for $9.90 with code 25T2UBGJ and clipping the 5% off coupon.
Coupon works on the Black，the Blue/Red and the Pink/Green Grips.
NOTE: DIFFERENT WITH THE OTHER $7 GRIPS ON AMAZON.
1. FASTSNAIL grips made of exclusive materials, more comfortable. Improved SL and SR buttons to extend the lifespan.
2. Package included 6 Thumb Stick Grips (4 Normal Thumb Stick Grips and 2 Extra Height Thumb Stick Grips)
As per the listing, they have this information as description:
Description：FASTSNAIL EXCLUSIVE MATERIALS - Our grips made of exclusive materials, with premium rubber non-slip matte surface for excellent grip. Scratch free, attractive appearance, touch is the best.
RGONOMIC DESIGN - Ergonomic design provides superior grip and enhanced comfort. Allow you to play for those extended, high-stress gaming sessions. Grab control and elevate your game with the FastSnail Grip Kit. (No include Switch Console and Joy-con.)EASY TO USE - Very easy to slip on and off without having to deal with any cumbersome latch mechanism.PROTECTION - Since it is a special cover, it can protect your Controller firmly from scratches and dirt.About FastSnail Joy-Con kit
1. Ergonomic design, enhanced comfort. Made the controllers much more ergonomic especially for longer playing times.
2. Makes using the SL and SR buttons.
3. The joycons easily slide in and out. With the little grooves guiding them into place.
4. Supported models: Your Switch Joy-Con.(No include Joy-Con)