If you need help with a specific task and are willing to pay someone to see it through then I would first mention it in the Chatterbox. See if anyone is interested or knows of someone who may be. If this is an ongoing need it may be more appropriate to post this on your home node and direct people to it. (Either, again, in the CB or possibly your signature temporarily)
Otherwise, as has been mentioned, I'm sure they'll make room for your generosity on the offering plate. :)
"...the adversities born of well-placed thoughts should be considered mercies rather than misfortunes." — Don Quixote