I say a lot of rosaries each week and I use all kinds of rosary aids I find on the Internet and Youtube and in booklets to help me. You are right that it would get very boring to say the same one all the time and it’s good to broaden our thoughts about the Mysteries by using different “helps”, that’s sort of the point.
There are lots of different Youtube videos. Be aware that you can change the speed of the video using the Settings gear so if the person on the video is praying too slow or too fast for you, you can set it to something more comfortable to pray along. Some are scriptural rosaries, some are stained glass windows, some are clips from movies about Christ’s life. Some of them have the late Father Peyton praying.
Also if you google “Scriptural Rosary” or “Rosary Meditations” you will get many, many web pages where there are different meditations to use. I can always find one I haven’t done yet or haven’t done in a while. Some are the kind where you read a line of scripture or a line of meditation for each Hail Mary and some are where you just read a meditation at the beginning and think of it all the way through.
You can also use any number of rosary books that are available for not very much from various Catholic rosary and gift shop websites. Seriously, this is one topic where there is an endless supply of books. If your church has a book lending room (some of mine do), you’ll probably find some in there to borrow so you don’t have to buy them. Sometimes the parish book rack also sells them for a couple bucks or you can find them on eBay. I’m sure there are apps with rosary meditations as well but I haven’t exhausted the web, youtube, and books yet so I haven’t looked into the apps.
Somebody on here recommended a technique where after each “thy womb Jesus” in the Hail Mary, you insert a word or phrase about the mystery you’re on. (Thanks very much to whoever on here suggested this! I’ve found it very helpful.) This works great for when I’m saying the rosary in the car and can’t read scripture or look at a video. Sometimes I use the same word all the way through the decade, like “blessed be the fruit of thy womb, Jesus, risen” for the Resurrection, and sometimes I’ll make it different for each Hail Mary, like the first one will be “Jesus, in the tomb” and the second one will be “Jesus, bursting out of the tomb” and the third one will be “Jesus, scaring the soldiers at the tomb” and the fourth one will be “Jesus, appearing to Mary Magdalene by the tomb” etc.