Broken Parts

I need to replace a couple of parts on a couple of my figures, and don't know where to get them. I need the right foot for an Energon Shockblast figure, and both gold shoulder pieces for Energon Scorponok.
I've tried several times to repair the broken parts I have, but they always broke again the first time I tried to transform the figures.
I've looked on Ebay, and there were no parts for sale at all for Shockblast, and the only Scorponok 'parts' sale I found already had the shoulders broken.
And the prices for entire new figures was well out of my price range.
Can anyone point me in the right direction?
I've tried several times to repair the broken parts I have, but they always broke again the first time I tried to transform the figures.
I've looked on Ebay, and there were no parts for sale at all for Shockblast, and the only Scorponok 'parts' sale I found already had the shoulders broken.
And the prices for entire new figures was well out of my price range.
Can anyone point me in the right direction?