Extension tube set does not affect image quality as there is no optics inside. increase ISO, decrease shutter speed;.
eBay
FOTGA Auto focus AF Macro Extension Tube 10mm+16mm Set for Sony NEX E Mount NEX7
Aliexpress UK
This macro extension tube set can be transform your lens into a macro lens. The set is consist of three tubes of different length, which can be used in any combination or individually to obtain the different magnification.
eBay
Meike MK-S-AF3A Metal Auto Focus Macro Extension Tube 10mm 16mm for Sony Mirrorless a6300 a6000 a7 a7SII NEX E-Mount Camera
Aliexpress UK
This looks to have been very little used.
eBay
Mcoplus Metal Auto Focus Macro Extension Tube Ring 10mm 16mm 21mm for Sony E-Mount A7 A7II A7III A7SII A6000 A6300 A6500 nex 5
Aliexpress UK
For Nikon 1 mount J1 J2 J3 V1 Cam. - This automatic macro Extension Tube Set is designed to enable a lens to focus closer than its normal set minimum focusing distance. Getting closer has the effect of magnifying your subject (making it appear larger in the viewfinder and in your pictures).
eBay
Meike MK-P-AF3B Auto Focus Macro Extension Tube Ring Kit for Panasonic Olympus M4/3 M43 MFT Mount Mirrorless Camera
Aliexpress UK
Ideal for macro photography, these tubes allow photographers to achieve a closer focusing distance for high-quality close-up shots.
eBay
Andoer Portable Auto Focus AF Macro Extension Tube Adapter Ring Replacement for Canon 60D 7D 5D II 550D EOS EF EF-S Mount Lens
Aliexpress UK
Good condition
eBay
Macro Extension Tube Adapter Ring Set For Nikon D7100 D7000 D5300 D5200 D5100 D5000 D3200 D3100 D3000 D700 D90 D80 DSLR Camera
Aliexpress UK
Provides images with better quality than close-up filter, a good substitution to expensive macro lenses for macro photography. 3 rings make 7 different combinations, which extends the lens focal length for close-up shot, and won't alter the optical quality to ensure there is no glare in image.
eBay
m65-m65x1mm 6/8/17/27/30/36/58mm Macro Extension Tube ring Adapte For 65mm Screw Mount Digital SLR Camera Lens
Aliexpress UK
For sale a set (10mm and 16mm )of Meike Autofocus extension tubes for Sony E mount cameras and lenses, these Macro tubes have plastic bayonet mounts but are a very high quality plastic. These are high quality AF tubes and are great value for money.
eBay
Meike X-Mount Auto Fucus Macro Extension Tube Ring for Fujifilm X-E4 X-H1 X-Pro3 X-S10 X-T4 X-T10 X-T20 X-T30 XT30II X-T200 X-H2
Aliexpress UK