Toys are easy. I have a huge collection of toys both actual adult toys bought from adult stores or on the internet. Extremerestaints.com is a good source for extreme toys. We also use hardware tools and even such things as an electric fly swatter or feather duster. But I assume from your question you actually mean including other people in your sexual time. I've found if the husband has friends even remotely interested in his wife that you can invite those friends out for a few drinks and back to your place for a movie or cards or whatever. Cards can become strip poker (cheat to make wife loss clothing) or a movie with lots of nudity. Wife wears her nighty to get comfortable for the movie and becomes touchy feely with hubby and then the other guys. I assure you no man will turn down free no strings attached pussy.
You can advertise on lots of different websites for other couples or single guys. I've found you can easily get guys this way and a few couples (few single ladies however). Adultfriendfinder worked for us back in the day. Haven't used it in a long time. Craigslist use to work well too.
Send me an email at firstname.lastname@example.org and maybe we can hook up too. If you guys as a couple are interested I assure you finding willing partners is easy.