Guitar picks are inevitably getting destroyed, the more you play with them. You can stop wasting money on branded guitar picks by producing picks yourself out of garbage/unusable items.

Find an expired credit/debit card and cut it in the shape of your liking with scissors (find a decent pair of sharp scissors; the smaller ones will have a hard time cutting the plastic item). Some people do the extra work of filing/rounding the edges of the pick with a sandpaper. I, personally, don't do it — your pick's edges will quickly get dull by simply playing (if you play Rocksmith, you're most probably using metal strings anyway).

I discovered that the plastic box of Tic Tac candies makes a nice (although quite flexible for some tastes) durable pick. I personally prefer thicker picks, but the Tic Tac picks are quite usable. I like that they're transparent. The material is PP (polypropylene), maybe it could become a better pick if you find something thicker made of polypropylene.
https://en.wikipedia.org/wiki/Polypropylene

I've seen people making picks out of compact discs (CDs). I've destroyed quite a few CDs/DVDs. They are made of multiple layers of plastic and metal (the thickest layer is usually the one made of acrylic — https://en.wikipedia.org/wiki/Poly(methyl_methacrylate) ). They are relatively hard to cut through and tend to shatter into very sharp parts, which means that there's a higher chance of you accidentally cutting yourself (you probably don't wanna cut yourself and spend the money that you're trying to save for bandages).

Feel free to try making picks from different unwanted items. Keep in mind the amounts of work and time that would be spent too. Of course, you can make fancier picks than the commercially sold ones by painting them, stamping them, engraving them, etc. You can even make a new business empire and start selling picks for profit. $_$

I'd say that the most suitable material for a pick is plastic (I am not sure of the perfect type ( https://en.wikipedia.org/wiki/Resin_identification_code ) yet, since my main instrument during the recent years became my bass and I'm not using picks for a long time now). I've seen and heard suggestions for using a coin. I wouldn't suggest it, because, if you use metal/alloy picks, you will significantly shorten the life of your strings (especially if they're, for example, tapewound*). This is admitted by metal/alloy pick experimentalists**. If you don't want to change strings (bass strings are somewhat expensive) often or even damage the body of your instrument (depending on how aggressive your strumming/picking is), then it's better to avoid using metal/alloy items for your picks. If you have doubts that the item is made of metal/alloy, instead of plastic, then it's better (i.e. safer and easier) to choose another item. How often do you see music stores selling picks made of metal/alloy? Rarely, if ever — my point, exactly.


* Tapewound strings are metal strings that are covered in plastic (they're a variation of flatwound strings). More information here:
https://www.sweetwater.com/insync/flatwound-vs-roundwound-bass-strings/
https://en.wikipedia.org/wiki/Bass_guitar_tuning#Strings_and_tuning
https://en.wikipedia.org/wiki/String_(music)#Flatwound

** More information here:
https://stampsound.com/can-you-use-metal-guitar-picks/

P.S.
I consider picks part of the controller for Rocksmith, so I believe this guide can be of some use to beginners. However, comments by seasoned pickmakers are welcome too — this "guide" can be greatly expanded. Cheers.