There are a handful of reputable sex toy sellers online. My personal recommendation is LoveHoney. They have the best prices, and the best customer support and returns policy. They also offer free express two day shipping to anywhere in the USA if you spend more than $100.
If you’re looking for interactive masurbators that synch to pre-recorded porn (including VR porn) or even live webcam girls or for remote sex with a lover, then Kiiroo is your place to go. Their groundbreaking male sex toys can be used simply as male masturbators too.
BestVibe is an online retailer that specializes in delivering the latest and increasingly sophisticated male masturbators from China. Particularly outstanding for their collection of blowjob machines.
Kanojo Toys is the largest Japanese sex toy store online. Real Japanese sex toys, dolls, blowjob machines, masturbators – even ‘sex pillows’ and used panties (!) – shipped internationally from Japan. Products are cheap, so save money on shipping by buying several or more each time you shop.