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I have an SRAM x7 rear derailleur only been using it a few months (through the rain) and the jockey wheels seem in a bad way. There's a lot of side to side play in them and the teeth look sharp when i think they should be squared off at the top, I think this is causing issues in a couple of gears which won't setup correctly. The rest of the drivetrains is brand new and seems to be working fairly well.

Given how expensive jockey wheels are, Is it generally worth replacing the jockey wheels in a derailleur at this point, or is it better to get a new derailleur. Seems a waste as I think its been on the bike for 4 months max.

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Jockey wheels often tend to be fairly loose on their bearings, so it's hard to tell if your description suggests a problem or not. But a set of replacement wheels is $15-25 (vs about 4x that for the derailer), so it seems to me that if you do have a problem replacing the wheels is worth a shot. –  Daniel R Hicks Mar 25 at 23:43
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What @DanielRHicks said. Plus derailleurs are designed to have replacement jockey wheels. A few months is a short time, I'd expect a few years, but if they're done they're done. –  andy256 Mar 26 at 0:57
    
not sure it is an efficent use of money to replace jockey wheels versus full RD. –  Batman Mar 26 at 9:31
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Go into your local bike shop and see if they have a bin of broken rear derailleurs that they use for parts (mine does). Ask them if you can grab some jockey wheels off of a busted derailleur and throw them a few bucks. –  Booker Mar 26 at 15:32
    
Before you even replace the wheels: - Side to side play is pretty normal. - Jockey wheels normally don't waer down that fast. - Mostly if some gears do not setup as quickly as supposed to on a fairly new bike, it is because the 'new' inner cable just stretched a bit. Did you try to re-tighten the cable a bit? –  Foxhill Mar 26 at 16:00

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