I would buy a new Dura-Ace rear derailleur.

:facepalm:

Why, he gave excellent advice?
If you are going to spend more money then get the better derailleur that comes with better pulleys anyway.
Plus your derailleur may very well be bent if the pulleys have been damaged.

If you want to replace the jockey pulleys purchase the Ultegra or Dura Ace pulleys and don't waste your money on anything else.

It really depends on the derailleur that you have. If it is undamaged and worth keeping, of course you can replace the jockey wheels. Original jockey wheels might not be the best choice because many of them use slowish bushing bearings (instead of low friction ball bearings).

And you can get new sealed bearing Tacx jockey wheels for under 20 bucks. They are super low resistance and they work great (but you don't need ceramic bearings, those are usually not a good use of your money). I have used Tacx jockey wheels for years, they are reliable and a good upgrade/replacement.

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Thanks! That's the kind of info I was looking for. I knew the Ultegra RD uses a bushing for the upper, figured I may as well switch to a sealed bearing if I'm going to replace anyway.
A couple of teeth on one of the pulleys got damaged, really don't see the need to replace the entire RD.
The $100 difference between replacement pulleys vs a new RD can be used elsewhere, such as swim coaching...

Perhaps you were exaggerating but:

You can get a brand new Ultegra derailleur for $50 to $70 all day long so the difference is not $100, it's more like $30 to $50.

All good, just make sure if you have a 10 speed RD, get 10 speed compatible pulleys. If you have an 11 speed RD, get 11 speed compatible pulleys.

Tacx makes steel bearing and stainless steel bearing pulleys (both are sealed bearings), get whichever fits your price and needs ...

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Advanced Aero TopTube Storage for Road, Gravel, & Tri...ZeroSlip & Direct-mount, made in the USA.
DarkSpeedWorks.com.....Reviews.....Insta.....Facebook
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Sorry, meant for the DA one as suggested above