You can make your own bolt buffer for next to nothing. You can either get a 1/4" poly bolt and cut it down to size, or you can use 1/4" poly fuel line with a pin cut to size to go inside it. I did the latter and it cost nothing. I already had some of the tubing and found a bolt that I was able to cut to size in my parts bin.
As far as the trigger goes, there is an excellent write up about doing your own trigger job over at Rimfire Central. I compared what he said against the hammers I bought and it seemed simple enough. There's also a video available from a gunsmith that takes you through the process step by step, however I no longer have the link. Google could probably find it for you, though. His video was excellent, however it was also somewhat of a PITA, because he was recommending small steps with reassembly and testing between each stroke of the file. I'm sure he was just making sure you were careful, though, because he said he no longer had to do all that. The only drawback to doing your own trigger job is that Ruger doesn't sell stock hammers to the general public, so if you ruin yours, you'll be trying to buy one from an individual who's already upgraded his with a store bought hammer.
I was planning to do mine, but found a Power Custom hammer on sale and decided to take the easier route. However, I believe I could have done it myself, FWTW.
I figured the cost wasn't too bad, since it was less than $30 and the results were outstanding.