These are the most common type you will encounter.
Although there are others. Being a judge for the Adepticon Team tournament for the past 10 years I made an effort to learn how to spot loaded dice. Fortunately the ones I posted above stick out like a sore thumb.
I personally have never caught anyone using loaded dice at Adepticon.
I saw them on amazon a while ago, reviews say they are heavily unbalanced (like you will notice it immediately).
In any case, here you go: https://www.amazon.com/Character-Builder-Loaded-Koplow-Games/dp/B001N1JIU8
Roll with advantage, then roll for sleight of hand to see if anyone notices.
Otherwise Amazon has then
Kaplow sells loaded d6 labeled as Character Builder Dice
Wow so many negative votes... I was referring to these. https://www.amazon.com/Character-Builder-Loaded-Koplow-Games/dp/B001N1JIU8
Why make it this obvious? Just buy some loaded dice.
It's better if they think they have a chance at winning
I used one of these but I’m sure you’ll be able to find cheaper
I have no idea where one would even begin to look for loaded dice.
There are tons of products like this.
Koplow Games Character Builder Loaded Dice https://www.amazon.com/dp/B001N1JIU8/ref=cm_sw_r_cp_api_glt_fabc_SG221WM9RPWMQG80JAHV
I had no idea things like this existed for RPGs.
It’s just “why?”
You. You are the one with no idea what you are talking about. Took me literally 2 seconds of searching. Here is the first google result:
Check this out at Amazon.com
Koplow Games Character Builder Loaded Dice https://www.amazon.com/dp/B001N1JIU8/ref=cm_sw_r_other_apa_i_t.MSDb1JHZC2A