Glad I could help!
If you're in the USA, the gigabit PoE injectors from UI are like $10, so pretty cheap (although add shipping and that might double the cost!).
Take a look at the bottom (or top, depending on your perspective) of the APs and look to see if they have 802.3af on the label -- if they do, they'll work with standard 802.3af PoE switches and injectors. Otherwise, you need to get a 24V passive injector like the ones you have. If you can use 802.3af, you might consider a PoE switch instead of the injectors.
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Thanks! 