When accepting a favor would impose a financial burden, I usually push back twice and then relent. (1) "Are you sure, I can absolutely get this?" (2)"It's really not a problem, I don't mind paying." If they're still insisting at this point, I'll pack down, especially if it's obvious they're trying to do a nice thing.
I used to be more reluctant to accept that sort of help from folks, but there's a quote from the Thomas Covenant series that goes something like "in accepting the gift, one honors the giver." It's kinda stuck with me since I read it; let people give you gifts, it makes them feel good. Graciously accept, and think about how to pay it forward/back.
I've got "Little Silhouetto of a LAN" and "Caught in a LANslide" for the 5 and 2.4ghz