There are good agencys that photo list, but please, please, please check out the agency throughly before signing. Check the agency feedback sticky and PM people for their experiences as well as post a thread asking for people to PM you with feedback. It is so easy to be sucked in my pictures of darling children only to be stuck with a terrible agency in a long, drawn out adoption. (Not saying this would be the case, just saying do your homework first!
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Good luck!