The best looking wheels I
: have seen are the 8" plastic spoked wheels they put on some jogging
: baby strollers, but short of buying a stroller I haven't found a source
: and I'm making do with the large plastic-centred lawn mower replacement
: wheels most hardware stores carry.

Very nifty and super clever. Post a photo?

For a CLC-style cart I built, I bought wheels from Scary Sports, a maker of carts for sit-on-tops, for $10 each. These are feather light and super tough.

Check it out:
http://www.scarysports.com/

--SF