i have a few old road bikes i want to turn into single speeds but i dont wanna spend the money on a new wheelset...whats the cheapest/easiest way to get them on the road...it would be nice if i could use the 27" wheels they came with...and i have one with 700's on it...any help would be appreciated...thanks

respace, redish - but be careful of bottoming out the spokes, slap on a bmx freewheel.

Have a look at fixedgeargallery.com/wheels

dont even have to redish, you can flip the chainring to the inside of the crank spider and put a lockring behind the singlespeed freewheel. it wont be perfect, but if you keep the chain tension up, itll work fine.

yep I agree - replace the freewheel with a BMX single cog freewheel and see how it goes. Redish if necessary. It helps if the hub is older and you're pulling off a 5/6 speed. I did that on an old wheelset, works fine.
Something like this:
https://www.niagaracycle.com/index.php?cPath=242

The least amount of work is to just remove the derailers, and find the combination of ratio and chain line, and shorten your chain to fit it.