This should be your first stop- they have a great selection of familiar styles and colors. Only serves North American customers.
The same selection of styles as Volks USA, but a bit easier to compare.
18-24mm, 1029 yen
Carries their own line of anime-style acrylic eyes. Very fast shipping, too.
Nice alternative to Volks, cheap shipping is a plus
A bit pricey for the Glib chara eyes
20mm $12, 22mm $13
The Junky Spot
They carry Glib, Hujoo and Parabox eyes in smaller sizes
Sells Volks goods at markup, also carries some custom-made eyes
Their line of Bling eyes is quite diverse but pricey, watch for annual sales
D Eye Y bases can be used to make your own custom eyes
Carries their own line of resin eyes. Sometimes slow to answer emails or ship orders for English speaking customers.
Custom anime eyes, can also manufacture eyes to order. Currently on hiatus
Canada-based creator, formerly operated as Juu-Yuki before abruptly closing. Unfortunately they have once again abruptly abandoned their store, so I can’t recommend ordering from them.