Cheapest drinkable ones are probably going to be Jim Beam. White, black, double oak, depending on your preference but those should be readily available and inexpensive comparatively. Nothing special but perfectly fine. They should be smooth like Makers but they won't be as "rich" flavored as Woodford.
Instead of Woodford, maybe try looking into Old Forester 86 (smooth) or 100 (a little more bitey like Knob). They're from the same distilling family and while not exact substitutes do share a lot in common. The 86 should be cheap. Old Forester 1920 took the spot as my favorite from Woodford Double Oak, so I'm a fan of the line.
My latest recently is Elijah Craig though, which I think is a bit cheaper than Woodford but on par.
And while I haven't had it, Four Roses yellow label is supposed to be decent. I've had their small batch and single barrel and liked them both.
Also, check out the 375ml section for some options too just to try something new. It's cheaper than committing to a whole bottle of something. And for the Jim Beams I think they should have hotel sample bottles of most of those for a couple bucks to try and see if you like any of them.