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You can find new injectors for under 30 dollars each, so rebuilt that cost about the same is not really a very good option.
Although you can find rebuilt IP's for around 200 dollars online, they seem to have a high failure rate.
I would expect about 4 to 5 hundred would give you a better chance at getting a good one.
I do put a dollar value on my time, going with the cheapest part I can find even though it has a warranty is usually not the least expensive way to fix something.
Save 100 dollars on the price, takes a couple hours to change the part, have to change it three times to get a good one, the more expensive part would wind up being less expensive.
And that says nothing for the down time waiting on parts.